Question

4.17 Indentify hypothesis, Part 1. Write the null and alternative hypothesis in words and then symbols for each pf the following situations.

A) New York is known as the "city that never sleeps". A random sample of a 25 New Yorkers were asked how much sleep they get per night. Do these data provide convincing evidence that New Yorkers on average sleep less than 8 hours a night?

B) Employees at a firm are worried about the effect of March Madness, a basketball championship held each spring in the US, on employee productivity. They estimate that on a regular business day employees spend on average 15 minutes of company time checking personal email, making personal phone calls, etc. They also collect data on how much company time employees spend on such non-business activities during March Madness. They want to determine if these data provide convincing evidence that employee productivity decreases during March Madness.

* Please write answers in clear penmanship writing or typing. Thanks.

Answer 1

(A)

(i) In words:

H0: Null Hypothesis: New Yorkers on average sleep greater than or equal to 8 hours a night.

H0: Alternative Hypothesis: New Yorkers on average sleep less than 8 hours a night.

(ii) In symbols:

H0: Null Hypothesis: 8

HA: Alternative Hypothesis: 8

(B)

(i) In words:

H0: Null Hypothesis Company time the employees spend on non-business activities during March Madness is less than or equal to .15 minutes

H0: Alternative Hypothesis: Company time the employees spend on non-business activities during March Madness is morethan .15 minutes

(ii) In symbols:

H0: Null Hypothesis: 15

HA: Alternative Hypothesis: > 15