A random sample of 20 female executives from companies with assets over $1 million
was selected and asked for their annual income and level of education. The ANOVA
comparing the average income among three levels of education rejected the null
hypothesis. The Mean Square Error (MSE) was 250. The following table summarized
the results:
To compare the mean annual incomes of female executives with a high school
education or less and female executives with a master’s degree or more, compute the
90% confidence interval.
A(n) _________ estimate states the range within which a population parameter
probably lies.
We are interested in knowing if the following frequency distribution is normally
distributed. The population mean and standard deviation of the data are 600 and 160,
respectively.
If the distribution was normally distributed, what is the probability that an observation
would be a member of the “800 up to 1000” class?
A data set has 100 observations. In the data, a quantitative variable’s highest value is
117 and its lowest value is 47. What is the minimum class interval that you would
recommend?
To verify that an observed frequency distribution is normally distributed, a ________
statistic is used to test the hypothesis that the sample data is normally distributed.
A continuous random variable can assume one of a(n) ____________ number of values
within a specific range.
In multiple regression, the ______________ summarizes the difference between the
predicted and actual values of the dependent variable.
If the slope of a regression line is zero, the orientation of the regression line is
_________, which indicates a lack of a relationship.
Ages (rounded to the nearest whole year) of employees at a large company were
grouped into a distribution with the following class limits:
20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
What is the class interval?
A university has 1,000 computers available for students to use. Each computer has a
250-gigabyte hard drive. The university wants to estimate the space occupied on the
hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used
with a standard deviation of 20 gigabytes. What is the probability that a sample mean is
between 111 and 119 gigabytes?
The proportion of the area under a normal curve that is to the right of z = -1.21 is
_______.
The relationship between interest rates as a percent (X) and housing starts (Y) is given
by the linear equation Ŷ = 4094 – 269X. For what interest rate will the maximum
number of housing starts be achieved?
A sample of five full-service gasoline stations, each carrying three grades of gasoline,
was taken, and the price per liter (to the nearest cent) was recorded for each grade of
gasoline, as shown in the following table.
What is the modal price of unleaded plus gas?
When testing a goodness-of-fit null hypothesis, and there are extremely large
differences between observed and expected frequencies, the null hypothesis should be
___________.
A statement about the value of a population parameter is called a ________________.
Ages (rounded to the nearest whole year) of employees at a large company were
grouped into a distribution with the following class limits:
20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
What is the midpoint for the class 40 up to 50?