Chapter 9 (3320)

Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed test (lower tail), a sample size of 10 at a .10 level of significance; t =

-1.383

For a two-tailed hypothesis test with a test statistic value of z = 2.05, the p-value is:

.0404

A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%.

.1056

A population has a mean of 180 and a standard deviation of 24. A sample of 64 observations will be taken. The probability that the mean from that sample will be between 183 and 186 is:

.1359

A random sample of 36 students at a community college showed an average age of 25 years. Assume the ages of all students at the college are normally distributed with a standard deviation of 1.8 years. The 98% confidence interval for the average age of all students at this college is:

24.30 to 25.70

The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of its tires has increased. In order to test the validity of this belief, the correct set of hypotheses is:

H0: μ ≤ 40,000 Ha: μ > 40,000

For a two-tailed test with a sample size of 40, the null hypothesis will not be rejected at a 5% level of significance if the test statistic is:

between -1.960 and 1.960, exclusively.

A sample of 92 observations is taken from a process (an infinite population). The sampling distribution of is approximately normal because:

of the central limit theorem.

The probability of making a Type I error is denoted by:

α