Day shift night shift

345 units sample mean 353 units

60 sample size 54

21 population standard deviation 28

what is the standard error for the mean difference between the night shift and the day shift?

a. 8685

b. 9319

c. 4.6764

d.8.0000

e. 21.8685

f. none the above

2 you would like to estimate the mean ( average) difference between the night shift and day shift. construct a 90% confidence interval of the mean difference between the night and day shifts. which interval correctly identifies a 90% confidence level?

a. - 1.1657 to 17. 1657

b. .3074 to 15.9626

c. 2.0005 to 13.9951

d. 6.1734 to 9.8266

e. 6.4670 to 9.5330

f. none the above

now use significance value of .05

3 what is the probability ( p-value) for this specific hypothesis test?

a. 1.9128

b. .9564

c. .0872

d. .0436

e. less than .0010

f none the above

what is the correct conclusion for this hypothesis test?

A. reject the null hypothesis

b. accept the null hypothesis

c. reject the null hypothesis and accept alternative hypothesis

d. accept the null hypothesis and reject alternative hypothesis

e none the above