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MAT 120 CHAPTER 8 AND 9 QUESTIONS AND 100% CORRECT ANSWERS 2024
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MAT 120 CHAPTER 8 AND 9 QUESTIONS AND 100% CORRECT ANSWERS 2024
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MAT 120 CHAPTER 8 AND 9 QUESTIONSAND 100% CORRECT ANSWERS 2024
confidence interval with sigma known - ANSWER 1) find mean and sigma
2) find z-score
3)E= (Z x sigma) / square root N
4)add and subtract the mean and E
a survey of 85 home owners finds that they spend on average $67 a month on home
maintenance with a population standard deviation of $14. find the 90% confidence
interval for the mean amount spent on home maintenance by all homeowners -
ANSWER confidence interval with sigma known
a sample of 140 dieters reported that they cheated on their diet an average of 7 time a
week with sigma = 1.5. calculate a 95% confidence interval for the average number of
times dieters cheat on their diets each week - ANSWER confidence interval with sigma
known
confidence intervals with sigma unknown - ANSWER 1) find mean and s
2) d.f. = n - 1
3) t-score
4) E= ( t X s) / square root n
5) add and subtract the mean and E
a sample of 37 plane crashers finds that the average number of deaths was 49 with a
standard deviation of 15. find 99% confidence interval for the average number of deaths
per plane crash - ANSWER confidence intervals with sigma unknown
Determining the Minimum sample size - ANSWER 1) find z, sigma, and E
2) N = ((z X sigma) / E) ^2
a poll conducted on November 19 2007 by American research group inc asked
American adults how much they planned to spend on gifts for Christmas how many
subjects are needed to estimate the amount of planned Christmas spending within $5
with90% confidence initial survey results indicate that sigma = $82.25 - ANSWER
determining the minimum sample size
proportion confidence interval (percent) - ANSWER 1) find p hat, q hat, and n
2) z-score
3) E = z X square root ((p hat X q hat) / n)
out of 190 adults surveyed 71 exercise on a regular basis construct a 90% confidence
interval for the percentage of all adults who exercise on a regular basis - ANSWER
proportion confidence interval ( percent)
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