Elly’s Hotdog Emporium is famous for its chilidogs. Elly’s latest sales indicate that 30%
of the customers order their chilidogs with hot peppers. Suppose 15 customers are
selected at random. What is the probability that between two and six people inclusive
want hot peppers?
There are eight flights from Minneapolis to St. Cloud each day. The probability that any
one flight is late is 0.10. Using the binomial probability formula, what is the probability
that none are late?
A committee that is studying employer-employee relations proposed that each employee
would rate his or her immediate supervisor, and in turn the supervisor would rate each
employee. To find reactions regarding the proposal, 120 office personnel and 160 plant
personnel were selected at random. Seventy-eight of the office personnel and 90 of the
plant personnel were in favor of the proposal. We test the hypothesis that the population
proportions are equal with a 0.05 significance level. What is our decision?
A university wants to determine the proportion of students who use a cash card to pay at
the university food service. Out of 100 students surveyed, 65 students use a cash card.
What is the 95% confidence interval for the population proportion?
If two dependent samples of size 100 are used to test the difference between the means,
the degrees of freedom for a t-statistic are _____.
A ____________ hypothesis test is indicated if the alternate hypothesis does not specify
a direction.
The first three class marks for a frequency distribution of “weights of college men”
recorded to the nearest pound are 105, 115, and 125.
What are the class limits for the fourth class?
A multiple regression analysis showed the following ANOVA table result.
Based on the information in the ANOVA, what is the decision regarding the global null
hypothesis?
If the sample correlation coefficient, r, is -0.96, the dependent variable ________ as the
independent variable increases.
To summarize the frequencies of two nominal or ordinal variables and compute
conditional probabilities, a ___________ can be used.
When observing a checkout line at a food store, the average number of people served is
30 per hour. Using the Poisson distribution, what is the standard deviation of the
number of people served in an hour?
There are eight flights from Minneapolis to St. Cloud each day. The probability that any
one flight is late is 0.10. Using the binomial probability formula, what is the probability
that exactly 1 flight is late?
A local grocery store wants to estimate the mean daily number of gallons of milk sold
to customers. Assume the number of gallons sold follows the normal distribution, with a
population standard deviation of 5.10 gallons. A random sample of 60 days shows that
the mean daily number of gallons sold is 10.00. Compute a 99% confidence interval for
the population mean.
Percentiles divide a frequency distribution into _________ equal parts.
In a study of protein breakfast bars, five bars from each of three brands were tested to
see if the mean amount of protein per bar differs among the brands. To select a critical
F-statistic, the number of degrees of freedom for the numerator is _____.
To test a hypothesis that a frequency distribution for sample data is normally
distributed, class limits are transformed using a ____________.
For a sampling distribution of means with a known population standard deviation,
______% of the means would be between 1.96 standard errors.