Here
The critical value for the significance level α=0.05 is zc = 1.96 The following formula is used to compute the minimum sample size required to estimate the population mean within the required margin of error:
Therefore, the sample size needed to satisfy the condition , and it must be an integer number, we conclude that the minimum required sample size is n = 6907.
1. You want to estimate the mean weightloss of people one year after using the Atkins...
type the answers please. Thanks :) 1) When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A random sample of 40 smokers has a mean cotinine level of 172.5. Assuming that is known to be 119.5, find a 94% confidence interval estimate of the mean cotinine level of all smokers. Write a sentence that interprets this interval. 2) You want to estimate the mean weight loss of people one year after following the Atkins...
7. You want to estimate the mean weight loss of people one year after using a popular weight-loss (1 point) program being advertised on TV. How many people on that program must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 ib of the true population mean? Assume that the population standard deviation is known to be 10.6 lb. 6907 0 4865 O 84 O6906 3. Given the standard deviation of...
How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 2.31b of the population mean, and the population standard deviation is known to be 14 lb. 143 126 101 202
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 21.3. You would like to be 95% confident that your estimate is within 5 of the true population mean. How large of a sample size is required?
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=26.9σ=26.9. You would like to be 95% confident that your estimate is within 1 of the true population mean. How large of a sample size is required?
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ = 45.7 . You would like to be 95% confident that your estimate is within 0.1 of the true population mean. How large of a sample size is required? n=
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=49.6σ=49.6. You would like to be 95% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required?
6) How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.4 lb of the population mean, and the population standard deviation is known to be 25 lb.
11. 45 adults used the Atkins weight loss program. After 12 months, the sample mean weight loss was found to be 2.1 lb, with a population standard deviation of 4.8 lb. Construct a 90% confidence interval to estimate the mean weight loss for all such subjects. a) Find the margin of error, E. b) What is the Confidence Interval? c) Interpret the confidence interval.
2) Suppose we want to estimate the mean mortage layment for homes in Denver. Suppose that it is known from past data thag the mean monthly mortage payment is $2500 with a standard deviation of $1000. If we want to be 92% confident that lur sample mean is within $300 of the population mean, what is the recommended sample size? 3) Suppose we want to estimate the proportion of homes in Denver that are valued at over $1,000,000. Suppose that...