7. A maker of microwaves advertises that no more than 10% of its ovens need repair during the first 5 years of use. In a random sample of 57 microwaves, 13% needed repair. At ? = .05, can you reject the maker's claim? Show all your steps.
Added by Sofia R.
Close
Step 1
Null hypothesis (Hā): p = 0.10 (The maker's claim is true, and no more than 10% of microwaves need repair.) Alternative hypothesis (Hā): p > 0.10 (The maker's claim is false, and more than 10% of microwaves need repair.) Show moreā¦
Show all steps
Your feedback will help us improve your experience
Lakshya H and 92 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A certain microwave manufacturer claims that the fraction p1 of his microwaves that need repairs in the first 7 years of operation is less than the fraction p2 of another brand. To test this claim, researchers observed 130 microwaves from each brand and found that x = 15 and y = 32 microwaves needed repairs, respectively. Do these data support the manufacturer's claim? Find the value of the test statistic (round off to first decimal place).
Ajiboye T.
The service manager for a new appliances store reviewed sales records of the past 20 sales of new microwaves to determine the number of warranty repairs he will be called on to perform in the next 90 days. Corporate reports indicate that the probability any one of their new microwaves needs a warranty repair in the first 90 days is 0.05. The manager assumes that calls for warranty repair are independent of one another and is interested in predicting the number of warranty repairs he will be called on to perform in the next 90 days for this batch of 20 new microwaves sold. Answer the following questions. (1) What type of probability distribution will most likely be used to analyze warranty repair needs on new microwaves in this situation? (2) What is the probability that none of the 20 new microwaves sold will require a warranty repair in the first 90 days? (3) What is the probability that there is some but not more than 5 of the 20 new microwaves sold will require a warranty repair in the first 90 days? What do you think of this chance?
Sheryl E.
The service manager for a new appliances store reviewed sales records of the past 20 sales of new microwaves to determine the number of warranty repairs he will be called on to perform in the next 90 days. Corporate reports indicate that the probability any one of their new microwaves needs a warranty repair in the first 90 days is 0.05. The manager assumes that calls for warranty repair are independent of one another and is interested in predicting the number of warranty repairs he will be called on to perform in the next 90 days for this batch of 20 new microwaves sold. What is the probability that less than two of the 20 new microwaves sold will require a warranty repair in the first 90 days?
Rashmi S.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD