Estimate the population mean by finding a 90% confidence interval given a sample of size 514, with a mean of 38.8 and a standard deviation of 13.8. Preliminary: a. Is it safe to assume that n < 0.05 of all subjects in the population? O No O Yes b. Is n > 30?
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Q: A researcher is interested in finding a 99% confidence interval for the mean number of times per day…
A: a. Suppose µ is the population mean number of times per day that college students text.
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Q: A researcher is interested in finding a 95% confidence interval for the mean number of times per day…
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Q: A researcher is interested in finding a 95% confidence interval for the mean number of times per day…
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Q: A researcher is interested in finding a 98% confidence interval for the mean number of times per day…
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- 1. The heights ( in inches) of the students on a campus are assumed to have a normal distribution with a standard deviation of 4 inches. A random sample of 49 students was taken with M=68 inches. The 95% confidence interval for the population mean is:It is desired to estimate the mean GPA of each undergraduate class at a large university. How large a sample is necessary to e stimate the GPA within 0.27at the 95% confidence level? The population standard deviation is 1.35A researcher is interested in finding a 90% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 41 students who averaged 33.9 minutes concentrating on their professor during the hour lecture. The standard deviation was 11.3 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a Correct distribution. b. With 90% confidence the population mean minutes of concentration is between ____ and ____ minutes. c. If many groups of 41 randomly selected members are studied, then a different confidence interval would be produced from each group. About ____ percent of these confidence intervals will contain the true population mean minutes of concentration and about ____ percent will not contain the true population mean minutes of concentration.
- A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 139 students who averaged 45.2 texts per day. The standard deviation was 19.2 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a [v distribution. b. With 98% confidence the population mean number of texts per day is between and texts. C. If many groups of 139 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day. Submit Question esc 000 D00 F1 F2 F3 F4 F5 F6 @ 2# 2$ 4 Q W E RA researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 99 students who averaged 32.3 texts per day. The standard deviation was 19.2 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a t distribution. b. With 98% confidence the population mean number of texts per day is between and texts. c. If many groups of 99 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals percent will not will contain the true population number of texts per day and about contain the true population mean number of texts per day.A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 112 students who averaged 26.7 texts per day. The standard deviation was 24.5 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 95% confidence the population mean number of texts per day is between and texts. c. If many groups of 112 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day.
- A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 124 students who averaged 30.6 texts per day. The standard deviation was 15.7 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With 95% confidence the population mean number of texts per day is between texts. and c. If many groups of 124 randomly selected members are studied, then a different confidence interval percent of these confidence intervals will contain would be produced from each group. About percent will not contain the true the true population number of texts per day and about population mean number of texts per day.A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 127 students who averaged 29.3 texts per day. The standard deviation was 14.4 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With 90% confidence the population mean number of texts per day is between texts. and c. If many groups of 127 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about will not contain the true population mean number of texts per day. percentA researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 141 students who averaged 29.2 texts per day. The standard deviation was 17.9 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 95% confidence the population mean number of texts per day is between and texts. c. If many groups of 141 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day. Hint: Hints
- A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 16 students who averaged 26.7 texts per day. The standard deviation was 18.5 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 98% confidence the population mean number of texts per day is between and texts. c. If many groups of 16 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day.A researcher is interested in finding a 99% confidence interval for the mean number of times per day that college students text. The study included 111 students who averaged 40.2 texts per day. The standard deviation was 22.8 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? 0 distribution. b. With 99% confidence the population mean number of texts per day is between and texts. c. If many groups of 111 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day.An IQ test is designed so that the mean is 100 and the standard deviation is 17 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 4 IQ points of the true mean. Assume that sigma equals 17 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. a. The required sample size is (Round up to the nearest integer.)