stats ch 9
n = 16H0: μ ≥ 80 x̄ = 75.607Ha: μ < 80 σ = 8.246 Assume the population is normally distributed.The test statistic equals _____.
-2.131
n = 16H0: μ ≥ 80 x̄ = 75.607Ha: μ < 80 σ = 8.246 Assume the population is normally distributed.Thep-value is equal to_____.
.0166
For a two-tailed hypothesis test with a test statistic value of z = 2.05, the p-value is _____.
.0404
Suppose a sample of employees from the manufacturing industry showed a sample mean of per hour. Assume a population standard deviation of per hour and compute the -value. Round your answer to four decimal places.
.121
n = 49H0: μ = 50 x̄ = 54.8Ha: μ ≠ 50 σ = 28 Thep-value is equal to _____.
.2302
n = 49H0: μ = 50 x̄ = 54.8Ha: μ ≠ 50 σ = 28 The test statistic equals _____.
1.2
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%.The test statistic is _____.
1.25
The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posting answers to frequently asked questions on its website (The Cincinnati Enquirer,January 7, 2010). According to a report by a taxpayer advocate, callers using the new system can expect to wait on hold for an unreasonably long time of minutes before being able to talk to an IRS employee. Suppose you select a sample of callers after the new phone service has been implemented; the sample results show a mean waiting time of minutes before an IRS employee comes on line. Based upon data from past years, you decide it is reasonable to assume that the standard deviation of waiting times is minutes. Use .
What is the P -value (to 4 decimals)?
Check My Work The manager of an automobile dealership is considering a new bonus plan in order to increase sales. Currently, the mean sales rate per salesperson is five automobiles per month. The correct set of hypotheses for testing the effect of the bonus plan is _____.
c. H0: μ ≤ 5 Ha: μ > 5
A random sample of 16 students selected from the student body of a large university had an average age of 25 years. We want to determine if the average age of all the students at the university is significantly different from 24. Assume the distribution of the population of ages is normal with a standard deviation of 2 years.At a .05 level of significance, it can be concluded that the mean age is _____.
not significantly different from 24
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%.At a .05 level of significance, it can be concluded that the proportion of the population in favor of candidate A is _____.
not significantly greater than 75%
In Hamilton County, Ohio the mean number of days needed to sell a home is days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of homes in a nearby county showed a sample mean of days with a sample standard deviation of days. Conduct a hypotheses test to determine whether the mean number of days until a home is sold is different than the Hamilton county mean of days in the nearby county. Round your answer to four decimal places.
p-value=.065
