Answered

Discover the answers you need at Westonci.ca, a dynamic Q&A platform where knowledge is shared freely by a community of experts. Get quick and reliable solutions to your questions from a community of experienced experts on our platform. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform.

Suppose the KittyCat brand of litter products manufactures 15 lb bags of litter. Lisa, a cat owner, believes that these bags contain less than 15 lb of litter. She collects data on a randomly selected sample of 70 KittyCat 15 lb litter bags and decides to use a hypothesis test to determine whether the mean weight is less than 15 lb. Lisa believes that the weight of all such bags of litter is normally distributed, but she does not know the population standard deviation. Which of the following hypothesis tests should Lisa use regarding her claim?
a. one-sample, right-tailed z-test for a mean
b. one-sample, right-tailed 1-test for a mean
c. one-sample, left-tailed t-test for a mean
d. one-sample, left-tailed z-test for a mean
e. one-sample, two-tailed t-tes for a mean

Sagot :

Considering that she does not know the population standard deviation, the hypothesis test that she should use is given by:

c. one-sample, left-tailed t-test for a mean.

What hypothesis test should she use?

First, we consider that she does not know the population standard deviation, hence a t-test should be used instead of a z-test.

Then, we consider that she suspects that the mean weight is less than 15 lb, and less is associated with a left-tailed test, instead of a right-tailed(associated with more) or a two-tailed(associated with different).

Hence option c is correct.

More can be learned about an hypothesis test at https://brainly.com/question/26454209

Thanks for using our service. We're always here to provide accurate and up-to-date answers to all your queries. We hope this was helpful. Please come back whenever you need more information or answers to your queries. Thank you for visiting Westonci.ca, your go-to source for reliable answers. Come back soon for more expert insights.