Archives: Quiz

X has the following probability distribution P(X). Compute the variance value of X. A. 1.58 B. .955 C. .912 D. .625 The U.S. Department of Health and Human Services collected sample data for 772 males between the ages of 18 […]

If = .0139 and 25 shipments of 20 items each were examined, what are the UCL and the LCL for the p chart? A. [.0118, .0159] B. [0, .0401] C. [.008, .0198] D. [0, .0924] Joe is considering pursuing an […]

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each […]

Which one of the following tools is not used to check the normality of residuals assumption for a multiple regression model? A. histogram B. stem-and-leaf display C. scatter diagram D. normal plot A control chart on which the proportions of […]

Using either the critical value rule or the p-value rule, if a one-sided null hypothesis is rejected at a given significance level, then the corresponding two-sided null hypothesis (i.e., the same sample size, the same standard deviation, and the same […]

A survey of the wine market has shown that the preferred wine for 17 percent of Americans is merlot. A wine producer in California, where merlot is produced, believes the figure is higher in California. She contacts a random sample […]

A graphical portrayal of a quantitative data set that divides the data into classes and gives the frequency of each class is a(n) ___________. A. ogive plot B. dot plot C. histogram D. Pareto chart E. bar chart During the […]

In determining the sample size to estimate a population proportion, as p approaches .5, the calculated value of the sample size ______________. A. stays the same B. decreases C. increases The EPA has stipulated that the Pollution Standard Index (PSI) […]

____________ theory is a methodology that attempts to determine the number of servers that strikes an optimum balance between the time customers wait for service and the cost of providing service. A. Exponential B. Binomial C. Uniform distribution D. Queuing […]

The ____________ hypothesis is not rejected unless there is sufficient sample evidence to do so. A. research B. alternative C. null D. true A random sample of 11 third-year medical school students took a comprehensive written exam as well as […]

Employees of a local university have been classified according to gender and job type. If an employee is selected at random, what is the probability that the employee is a member of the hourly staff, given that the employee is […]

When testing a hypothesis about a single mean, if the sample size is 20, the population standard deviation is unknown, and the population is assumed to be a normal distribution, the correct test statistic to use is ___________. A. r […]

A confidence interval for the population mean is meant to contain a specified percentage of the individual population measurements. Regression models that employ more than one independent variable are referred to as multiple regression models. Answer: TRUE An event is […]

If the number of surface nonconformities on a specific size of a metal piece is the discrete random variable in question, then the appropriate probability distribution that can describe the probability of a specific size metal sheet containing 3 nonconformities […]

In systematic sampling, the first element is randomly selected from the first (N/n) elements. The population mean is the average of the population measurements. Answer: TRUE We are testing H0: μ ≤ .95; versus HA: μ > .95. When = […]

If events A and B are mutually exclusive, then P(A|B) is always equal to zero. The binomial experiment consists of n independent, identical trials, each of which results in either success or failure and is such that the probability of […]

In an observational study, the variable of interest is called a response variable. It can be established at α = .05 that a majority of students favor the plus/minus grading system at a university if in a random sample of […]

Jeff sells the New York Times Sunday newspaper at a city corner near several churches. He sells each newspaper for $6.50 after purchasing them for $4.00. Any unsold newspaper can be returned to the New York Times for a $0.75 […]

The following data set represents the age of a random sample of cars on the road today. The variance of this sample is ________. A) 9.5 B) 16.4 C) 19.2 D) 23.7 A(n) ________ is a category in a frequency […]

The Canadian government would like to test the hypothesis that the average hourly wage for men is more than $2.00 higher than the average hourly wage for women. The following data summarizes the sample statistics for hourly wages for men […]

Travelocity would like to test if the standard deviation for roundtrip airfares between New York and London is less than $200. A random sample of 22 roundtrip airfares between New York and London had a standard deviation of $142. The […]

Two real estate companies, Century 21 and RE/MAX, compete with one another in a local market. The manager of the Century 21 office would like to advertise that homes listed with RE/MAX average more than 10 days on the market […]

According to the Mortgage Bankers Association, 11% of U.S. mortgages were delinquent last year. A delinquent mortgage is one that has missed at least one payment but has not yet gone to foreclosure. A random sample of six mortgages was […]

When perfect negative autocorrelation is present in a time series, the Durbin-Watson statistic will be equal to ________. A) 0 B) 1 C) 3 D) 4 The ______________________ represents the expected payoff we will realize if we have prior knowledge […]

Edmunds.com would like to test the hypothesis that the standard deviation for the age of an imported car on the road is greater than the standard deviation for the age of a domestic car. The following data shows the ages […]

Costco Wholesale claims that Costco members prefer its Kirkland brand toilet paper over the leading national brand. To test this claim, Costco recorded the preferences of a random sample of customers which are summarized in the table below. The appropriate […]

________ probability is used when we know the number of possible outcomes of the event of interest and the total number of possible outcomes in the sample space. A) Empirical B) Simple C) Subjective D) Classical The following data represent […]

A random sample of 13 hotels in Boston had an average nightly room rate of $172.10 with a sample standard deviation of $23.90. The approximate standard error of the mean for this sample is ________. A) 6.62 B) 11.56 C) […]

The Centers for Disease Control (CDC) would like to test the hypothesis that the proportion of obese adults in the U.S. has increased this year when compared to last year. A random sample of 125 adults this year found that […]

The average weight of the entire batch of the boxes of cereal filled today was 20.15 ounces. A random sample of four boxes was selected with the following weights: 20.05, 20.56, 20.72, and 20.43. The sampling error for this sample […]

Expedia would like to test the hypothesis that the proportion of Southwest Airline flights that arrive on-time is less than 0.90. A random sample of 140 United Airline flights found that 119 arrived on-time. Expedia would like to set α […]

A home appraisal company would like to develop a regression model that would predict the selling price of a house based on the age of the house in years (X1), the living area of the house in square feet (X2) […]

American Greetings would like to test the hypothesis that the median amount of money spent per person on Mother’s Day increased this year when compared to last year. The following data represents the amount of money that the same eight […]

DLP projectors are used in the majority of cinema projection systems and require a special light bulb to display a picture. Assume that the average life of a DLP bulb is 2,000 hours and that this failure time follows the […]

According to the Insurance Research Council, 14% of U.S. drivers are uninsured. A random sample of seven drivers was selected. What is the mean of this distribution? A) 0.98 B) 1.15 C) 1.64 D) 2.12 A beach community on a […]

The Department of Housing and Urban Development (HUD) would like to test the hypothesis that the average size of a newly constructed house last year is different from the average size of a newly constructed house in 2000. The following […]

The statistical technique where many samples are repeatedly drawn from a population is known as ____________. A) convenience sampling B) nonprobability sampling C) resampling D) probability sampling The Canadian government would like to test the hypothesis that the average hourly […]

The proportion of customers that rate their latest airline experience as “excellent” is an example of _______________. A) secondary data B) qualitative data C) descriptive statistics D) inferential statistics Increasing the number of periods in a simple moving average forecast […]

Chris is employed by Silver Lake Resort in Orlando, Florida, and sells timeshares. The following table shows the number of timeshare sales for Chris for each quarter over the past three years. The following dummy variables were created: The regression […]

The table below shows the number of cars sold last month by seven employees at Concord Motors and their number of years of sales experience. Management would like to use simple regression analysis to estimate monthly car sales using the […]

Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the table below. Management would […]

Use the information below to answer the following question(s). Hats-R-Us would like to produce a new design of hats for the upcoming Major league Baseball World Series. They need to decide to produce a large quantity or small quantity of […]

The Canadian government would like to test the hypothesis that the average hourly wage for men is more than $2.00 higher than the average hourly wage for women. The following data summarizes the sample statistics for hourly wages for men […]

The primary purpose of stratified sampling is to make the sampling process ____________. A) more convenient B) more economical C) less biased D) more accurate Use the following information to answer the question(s) below. The National Football League has developed […]

Use the information below to answer the following question(s). Cars.com would like to use simple regression to predict the selling price of a used car, in thousands of dollars, based on the age of the car in years. A random […]

The Department of Education would like to test the hypothesis that the median debt load of graduating students with a Bachelor’s degree is equal to $17,000. The following table summarizes the debt load of a random sample of graduating students […]

The Department of Transportation would like to test the hypothesis that the average age of cars on the road is less than 12 years. A random sample of 45 cars had an average age of 10.6 years. It is believed […]

During the 2013 Major League Baseball season, the St. Louis Cardinals averaged 41,602 fans per home game. Suppose attendance during the season follows the normal probability distribution with a standard deviation of 9,440 per game. The interval around the mean […]

The following contingency table shows the number of two-bedroom apartments grouped by monthly rent and location. The probability that a randomly selected apartment from this group has a monthly rental from $600 to under $700 and is located in Dover […]

The average salary for a sales representative in a medical billing company is $46,600 with a standard deviation of $6,400. The coefficient of variation for salaries at this company is ______. A) 9.0% B) 11.7% C) 13.7% D) 16.4% The […]