Question

3. Scores on a statistics exam are given: 85 72 92 90 74 65 68 59 74 85 63 79 81 92 95 74 88 55   

Use this data to calculate the:

A) mean __________ B) median ________ C) mode ________ D) range ________

E) standard deviation _________ F) find the z-score for a test grade of 90._______

G) Construct a stem and leaf display using this data.

H) Construct a box and whisker plot using this data.

I) Construct a 90% confidence interval for u.

J) Does this data provide sufficient evidence at the a = .05 level of significance to conclude that the mean score is greater than 75?

K) State the appropriate hypotheses to conduct the test:

ii   Calculate the value of the test-statistic

iii. Give the p-value of the test

iv. Using a 5% significance level, what is your conclusion? Why?

Answer 1