Questions from Statistics Principles

Q: Referring to Exercise 6.49, use MINITAB or another package

Referring to Exercise 6.49, use MINITAB or another package program to make a normal-scores plot of the computer anxiety scores in the Data Bank. Data from Exercise 6.49: Use a computer program to mak...

Q: Refer to Exercise 6.53 and to the data on velocity

Refer to Exercise 6.53 and to the data on velocity for females. Make a normal-scores plot for the square root of the velocity. Comment on the agreement with the ideal straight-line pattern. Data from...

Q: The number of PCBs was measured in 40 samples of soil that

The number of PCBs was measured in 40 samples of soil that were treated with contaminated sludge. The following summary statistics were obtained. x = 3.56, s = .5 ppm (a) Perform a test of hypothese...

Q: In each case, identify the null hypothesis (H0) and

In each case, identify the null hypothesis (H0) and the alternative hypothesis (H1) using the appropriate symbol for the parameter of interest. (a) A consumer group plans to test-drive several cars o...

Q: A literary critic wants to establish that the mean number of words

A literary critic wants to establish that the mean number of words p er sentence, appearing in a newly discovered short story, is different from 9.1 words. A sample of 36 sentences provided the data...

Q: Calculate the mean and standard deviation for the probability distribution.

Calculate the mean and standard deviation for the probability distribution.

Q: A test will be conducted to see how long a seven-

A test will be conducted to see how long a seven-ounce tube of toothpaste lasts. The researcher wants to establish that the mean time is greater than 30.5 days. From a random sample of size 75, an inv...

Q: In a given situation, suppose H0 was rejected at a =

In a given situation, suppose H0 was rejected at a = .05. Answer the following questions as "yes," "no," or "can't tell" as the case may be. (a) Would H0 also be rejected at a = .03? (b) Would H0 al...

Q: Refer to the data on the amount of reflected light from urban

Refer to the data on the amount of reflected light from urban areas in the Data Bank. A computer calculation for a test of H0 : µ = 84 versus H1 : µ ≠ 84 ha...

Q: One day, the visits of n = 48 students to the

One day, the visits of n = 48 students to the social network site produced the summary statistics x = 35.96 minutes and s = 29.11 minutes n = 48 (a) Calculate a 90% confidence interval for the mean d...