A survey of a simple random sample of 140 dieters revealed that the numbers of times...
A survey of a simple random sample of 140 dieters revealed that the numbers of times they “cheated” on their diets had a mean of 7.0 times per week. Construct and interpret a 99% confidence interval for the mean number of times dieters “cheat” on their diets each week. Assume that the population standard deviation is 1.5 times per week.
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A survey of a simple random sample of 140 dieters revealed that
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4. A survey asked a random sample of 363 first-year students how many hours they studied...
4. A survey asked a random sample of 363 first-year students how many hours they studied during a particular week. The mean was 15.3 hours. Suppose we know that the population standard deviation is 8.5 hours. Construct a 90%, 95% and 99% confidence interval for the mean study time of all first year students at this university. Interpret the 90% confidence interval.
A. A random sample of 32 different juice drinks has a mean of 98 calories per...
A. A random sample of 32 different juice drinks has a mean of 98 calories per serving and a standard deviation of 31.5 calories. Construct a 99% confidence interval of the population mean number of calories per serving, and interpret the 99% confidence interval in 1 sentence: B. A random sample of 50 standard hotel rooms in Philadelphia, PA, has a mean nightly cost of $189.99 and a standard deviation of $35.25. Construct a 95% confidence interval of the mean...
9. A simple random sample of 37 weights of pennies made after 1983 has a sample...
9. A simple random sample of 37 weights of pennies made after 1983 has a sample mean of 2.4991 g and a known population standard deviation of 0.0165 g. a. Construct a 99% confidence interval estimate of the mean weight of all such pennies. b. Design specifications require a population mean of 2.5 g. What does the confidence interval suggest about the manufacturing process? 10. A random sample of 40 students has a mean annual earnings of $3120 and a...
A simple random sample of 90 items from a population with = 9 resulted in a...
A simple random sample of 90 items from a population with = 9 resulted in a sample mean of 38. If required, round your answers to two decimal places. a. Provide a 90% confidence interval for the population mean. to b. Provide a 95% confidence interval for the population mean. to c. Provide a 99% confidence interval for the population mean. to Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample...
A simple random sample of size n = 40 is drawn from a population. The sample...
A simple random sample of size n = 40 is drawn from a population. The sample mean is found to be x= 120.9 and the sample standard deviation is found to be s = 12.1. Construct a 99% confidence interval for the population mean. The lower bound is (Round to two decimal places as needed.)
How many computers? In a simple random sample of 185 households, the sample mean number of...
How many computers? In a simple random sample of 185 households, the sample mean number of personal computer ls was 1.64. assume the population of the standard deviation is 0.47 a) construct a 99.9% confidence interval for the mean number of personal computers. round the answer to at least two decimal places. a 99.9% confidence interval for the mean number of personal computers is ---< mean <----- 2) In a sample of 75 clamps, the mean step to complete this...
simple random sample of size n= 40 is drawn from a population. The sample mean is...
simple random sample of size n= 40 is drawn from a population. The sample mean is found population mean. be x 120.6 and the sample standard deviation is found to be s 12.6. Construct a 99% confidence interval for the The lower bound is (Round to two decimal places as needed.)
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 106, and the sample standard deviation, s, is found to be 10. (a) Construct a 90% confidence interval about u if the sample size, n, is 22. (b) Construct a 90% confidence interval about u if the sample size, n, is 27. (c) Construct a 99% confidence interval about u if the sample size, n, is...
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 115, and the sample standard deviation, s, is found to be 10 (a) Construct a 98% confidence interval about if the sample size, n, s 14 (b) Construct a 98% confidence interval about μ if the sample size, n, is 19 (c) Construct a 99% confidence interval about if the sample size, n, s 14 (d)...
A simple random sample of 900 elements generates a sample proportion 0.72 a. Provide the 90%...
A simple random sample of 900 elements generates a sample proportion 0.72 a. Provide the 90% confidence interval for the population proportion (to 4 decimals). b. Provide the 99% confidence interval for the population proportion (to 4 decimals). How large a sample should be selected to provide a 95% confidence interval with a margin of error of 3? Assume that the population standard deviation is 50, Round your answer to next whole number. Sales personnel for Skillings Distributors submit weekly...
4. A survey asked a random sample of 363 first-year students how many hours they studied during a particular week. The mean was 15.3 hours. Suppose we know that the population standard deviation is 8.5 hours. Construct a 90%, 95% and 99% confidence interval for the mean study time of all first year students at this university. Interpret the 90% confidence interval.
A simple random sample of size n = 40 is drawn from a population. The sample mean is found to be x= 120.9 and the sample standard deviation is found to be s = 12.1. Construct a 99% confidence interval for the population mean. The lower bound is (Round to two decimal places as needed.)
simple random sample of size n= 40 is drawn from a population. The sample mean is found population mean. be x 120.6 and the sample standard deviation is found to be s 12.6. Construct a 99% confidence interval for the The lower bound is (Round to two decimal places as needed.)
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 106, and the sample standard deviation, s, is found to be 10. (a) Construct a 90% confidence interval about u if the sample size, n, is 22. (b) Construct a 90% confidence interval about u if the sample size, n, is 27. (c) Construct a 99% confidence interval about u if the sample size, n, is...
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 115, and the sample standard deviation, s, is found to be 10 (a) Construct a 98% confidence interval about if the sample size, n, s 14 (b) Construct a 98% confidence interval about μ if the sample size, n, is 19 (c) Construct a 99% confidence interval about if the sample size, n, s 14 (d)...
A simple random sample of 900 elements generates a sample proportion 0.72 a. Provide the 90% confidence interval for the population proportion (to 4 decimals). b. Provide the 99% confidence interval for the population proportion (to 4 decimals). How large a sample should be selected to provide a 95% confidence interval with a margin of error of 3? Assume that the population standard deviation is 50, Round your answer to next whole number. Sales personnel for Skillings Distributors submit weekly...
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