# Question

Consider the following hypotheses:

H0: µ ≥ 150

HA: µ < 150

A sample of 80 observations results in a sample mean of 144.

The population standard deviation is known to be 28.

a. What is the critical value for the test with α = 0.01 and with α = 0.05?

b. Does the above sample evidence enable us to reject the null hypothesis at α = 0.01?

c. Does the above sample evidence enable us to reject the null hypothesis at α = 0.05?

H0: µ ≥ 150

HA: µ < 150

A sample of 80 observations results in a sample mean of 144.

The population standard deviation is known to be 28.

a. What is the critical value for the test with α = 0.01 and with α = 0.05?

b. Does the above sample evidence enable us to reject the null hypothesis at α = 0.01?

c. Does the above sample evidence enable us to reject the null hypothesis at α = 0.05?

## Answer to relevant Questions

Redo the preceding question using the p-value approach.It is advertised that the average braking distance for a small car traveling at 65 miles per hour equals 120 feet. A transportation researcher wants to determine if the statement made in the advertisement is false. She ...On average, a college student last year graduated with $27,200 in debt (The Boston Globe, May 27, 2012). A researcher collects data on debt from 40 recent undergraduates from Connecticut. The data set, labeled ...In order to test if the population mean differs from 16, you draw a random sample of 32 observations and compute the sample mean and the sample standard deviation as 15.2 and 0.6, respectively. Use (a) The p-value approach ...In September 2007, U.S. home prices continued to fall at a record pace, and price declines in Los Angeles and Orange counties in California outpaced other major metropolitan areas (Los Angeles Times, November 28, 2007). The ...Post your question

0