Questions from Business Statistics

Q: 9. In a normal distribution, what values of z should

9. In a normal distribution, what values of z should we choose if we want 90% of the area under the curve symmetrically distributed around the mean? a) ( 1.00 b) ( 1.50 c) ( 1.645 d) ( 1.96 10. In a n...

Q: A t-distribution is similar to the z-distribution except

A t-distribution is similar to the z-distribution except that __________. a) It is not unimodal b) It is not symmetrical c) It has more area in the tails d) It is not bell-shaped 21. The following ra...

Q: All statistical hypotheses consist of two parts, __________ and __________.

All statistical hypotheses consist of two parts, __________ and __________. a) A null hypothesis; a full hypothesis b) A null hypothesis; a substitute hypothesis c) A null hypothesis; an alternate hyp...

Q: A test of the hypotheses, H0: p = 0.

A test of the hypotheses, H0: p = 0.18 and H1: p > 0.18 is a __________. a) One-tailed test b) Two-tailed test c) Test of two sample means d) Test of two sample proportions 14. A test of the hypothese...

Q: The dean of a business school claims that the average starting salary

The dean of a business school claims that the average starting salary of its graduates is more than 85 (in $000’s). It is known that the population standard deviation is 10 (in $000’s). Sample data on...

Q: A nutritionist for a university wants to determine an average BMI of

A nutritionist for a university wants to determine an average BMI of its students by taking a random sample of 50 students. The standard deviation of the BMIs of population of students is unknown. She...

Q: To determine whether two brands of car tires differ in their performance

To determine whether two brands of car tires differ in their performance measured in terms of the average wear over the first 10,000 miles, we should conduct __________. a) One hypothesis test for the...

Q: Some common applications of statistics in business include which of the following

Some common applications of statistics in business include which of the following: a) Predicting the outcome of an election b) Determining consumer sentiment c) Estimating salary data for various demo...

Q: A human resources manager wants to conduct a “before/after

A human resources manager wants to conduct a “before/after” study on 16 employees to determine if a motivation seminar results in an increase in their ratings of th...

Q: A manager wants to test if there is a significant difference in

A manager wants to test if there is a significant difference in the variance of the output from two similar machines. It has been determined that the output of the two machines is normally distributed...