A test is performed with a sample of size 100. The sample mean was 6.90 and the population standard deviation is 60. Assume that the population is approximately normal. Use the TI-84 PLUS calculator to compute the P-value.

A test is performed with a sample of size 36. The sample mean was 2.36 and the population standard deviation is 18. Assume that the population is approximately normal.Compute the P-value.

Six measurements were made of the mineral content (in percent) of spinach, with the following results. It is reasonable to assume that the population is approximately normal.

19.1, 20.1, 20.8, 20.5 , 20.5, 19.3

Find the lower bound of the 95% confidence interval for the true mineral content.

utility company sampled 401 customers, and finds that 148 of them had a discrepancy on their service bill. What is the upper bound for the 99% confidence interval for the proportion of customers with a discrepancy on their service bill? A simple random sample of 12 e-readers of a certain type had the following minutes of battery life.

287, 311, 262, 392, 313, 314, 268, 316, 286, 267, 260, 291

Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 58. What is the upper bound of the 95% confidence interval for the battery life for all e-readers of this type?

A random sample of 13 students were asked how long it took them to complete a certain exam.The mean length of time was 122.2 minutes, with a standard deviation of 80.0 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam. A random sample of 64 second-graders in a certain school district are given a standardized mathematics skills test. The sample mean score is 51.22 . Assume the standard deviation for the population of test scores is 15. The nationwide average score on this test is 50. The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average. Perform the hypothesis test and compute the P-value.

Following are the weights of 5 boxes of cookies, each of which is labeled as containing 16 ounces. Assume that the population of weights is normally distributed.

15.91, 14.50 , 14.88, 16.07, 14.79

A quality control inspector wants to know whether the mean weight is actually less than 16 ounces. Compute theP-value of the test.

Suppose that the mean price of a home in Denver, Colorado in 2008 was 225.3 thousand dollars. A random sample of 49 homes sold in 2010 had a mean price of 201.4 thousand dollars. A real estate firm wants to test to see if the mean price in 2010 differs from the from mean price in 2008. Assume that the population standard deviation is 140. Perform the hypothesis test and compute the P-value.

For an online auction, the following table presents the prices of a group of items (x) and the number of people participating in the auction (y).

x 77 76 77 72 76 77

y 248 225 241 209 225 231

Compute the correlation coefficient.Round your answer to three decimal places.Write only a number as your answer.

The following table lists the ages for a sample of couples on a vacation cruise.

x45 54 45 55 59 49

y55 44 46 64 69 63

The least-squares regression line is in the formy=b₀+b₁x.Compute the value ofb₁.That is, compute the slope.Round your answer to two decimal places.Write only a number as your answer The following table number of absences (x)and the grade earned on the first exam (y)for a Statistics class.

x3 5 2 6 5 8

y75 76 91 54 84 45

The least-squares regression line is in the formy=b₀+b₁x.Compute the value ofb₀.That is, compute the intercept.Round your answer to two decimal places.Write only a number as your answer.er.