The distribution of actual weight of tomato soup in a 16 ounce can is thought to be bell-shaped with a mean equal to 16 ounces, and a standard deviation equal to 0.25 ounces. Based on this information, between what two values could we expect 95 of all cans to weigh?
a. 15.75 to 16.25 ounces
b. 15.50 to 16.50 ounces
c. 15.25 to 16.75 ounces
d. 15 to 17 ounces
e. 15 to 16 ounces
Q. 2Describe how one could select two dependent samples from among his/her co-workers in General Motors to compare their starting salaries after graduation from high school to their salaries when they continue working at GM and reach the age of 40.
Q. 3The lengths of screws produced by a machine are normally distributed with a mean of 3 inches and a standard deviation of .2 inches. Therefore, we know:
a. that approximately 68 percent of all screws have lengths between 2.8 and 3.2 inches
b. that approximately 95 percent of all screws have lengths between 2.8 and 3.2 inches
c. that just about all screws have lengths between 2.8 and 3.2 inches
d. that approximately 98 percent of all screws have lengths between 2.8 and 3.2 inches
e. none of these
Q. 4Studies that involve paired subjects deal with
a. dating service samples.
b. independent samples.
c. dependent samples.
d. None of the above.
Q. 5Whenever a statistical population can be described, at least roughly, by the perfectly symmetrical, bell-shaped normal curve, we can estimate the percentages of all population values that lie within specified numbers of standard deviations from the mean with the help of:
a. Tchebysheff's Theorem
b. the empirical rule
c. the interquartile range
d. box plot
e. none of these
Q. 6A political analyst in Michigan surveys a random sample of registered Democrats and compares the results with those obtained from a random sample of registered Republicans. This would be an example of:
a. dependent samples.
b. independent samples.
c. independent samples only if the sample sizes are equal.
d. dependent samples only if the sample sizes are equal.
Q. 7Given a distribution of measurements that is approximately mound-shaped, the Empirical Rule states that the approximate percentage of measurements in a data set that fall within two standard deviations of their mean is approximately:
a. 99
b. 95
c. 90
d. 68
e. 75
Q. 8Which of the following statements is false?
a. Comparing the final test scores of male and female students in your statistics class is an example of two dependent samples.
b. Pretest versus posttest (before versus after) studies usually use dependent samples.
c. Studies involving identical twins result in dependent samples of data.
d. None of the above
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