4. The following sample of numbers is chosen from a normally distributed population. 22, 25, 28, 30, 27 The 95% confidence interval for the population mean is (A) 26.4 ± 1.0033 (B) 26.4 ± 1.3638 (C) 26.4 ± 2.2435 (D) 26.4 ± 2.6731 (E) 26.4 ± 3.7860

Q: A sample of 28 was taken from a population, and r = .45. What is the 95% confidence interval for the…

A: Correlation coefficient: Correlation analysis is used to measure strength of the association between…

Q: A sample of 26 observations is taken from a normal Histribution with unknown mean. The sample mean…

A: The 95% confidence interval for the true population mean is obtained below as follows: The formula…

Q: Compute the 95% confidence interval for the mean and the 95% confidence interval for the standard…

A: TickerJuly($)September($)NIKE110.3996.62WBA29.9722.24DOW56.4751.56DIS88.8981.05INTC35.7735.55MSFT335…

Q: Gasoline Use A random sample of 36 drivers used on average 749 gallons of gasoline per year. If the…

A:

Q: A student wanted to construct a 99% confidence interval for the mean age of students in her…

A: Solution:From the given information, number of students is 9 and confidence level is 99%, sample…

Q: if a sample n = 16, mean = 10.3,standard deviation is 2.6. calculate a 95% confidence interval.

A:

Q: if E=0.07 and population standard deviation=0.8 then find the sample size for 99% confidence…

A: Margin of error(E)=0.07 population standard deviation(σ)=0.8 confidence level=99%

Q: Random samples of female and male undergraduates are asked to estimate the number of times a week…

A: Females (Population 1): 6, 3, 2, 6, 6, 6, 5, 2, 3, 4                           x1 = 4.3…

Q: A simple random sample of 40 items resulted in a sample mean of 25. The population standard…

A: Given,   Sample size = 40 Sample mean = 25 Population standard deviation = 5   Since the population…

Q: of residents in their tropical Researchers from a certain country were interested in how…

A: For male Mean=10.9 Standard deviations=0.9 Smaple size=93   For female Mean=10.3 Standard…

Q: mean = 9.4285 Standard deviation= 2.0188 count= 35 students 1. Give and interpret the 95% confidence…

A: From the given information,Mean (x-bar) = 9.4285Standard deviation (σFrom the given information,Mean…

Q: 21. What is the 98% confidence interval for the difference in population means, p1 – p2 given the…

A: Let p1 denotes the population proportion for population 1 and p2 denotes the population proportion…

Q: the following sample was taken from a normally distributed population: 20,27,15,2016,22 and 13. A…

A:

Q: A sample of 64 was taken from a population, with the mean of the sample being 25 and the standard…

A: It is given that  Sample mean = 25 Sample standard deviation = 2 Sample size = 64 Confidence level =…

Q: Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made…

A: From the provided information, Sample size (n) = 65 Sample mean (x̅) = 19.5 Sample standard…

Q: Find a 95% confidence interval for the difference between full attendance students' Exam 5 score and…

A: We have given data,  Less attendance Full attendance 90 96 90 96 60 100 50 99 69   88…

Q: Construct a 95% confidence interval for p, - Pɔ. The sample statistics listed below are from…

A:

Q: A random sample of 25 individuals finds a sample mean value of 18 and sample standard deviation of…

A: Given information- Sample size (n) = 25 Mean x̅ = 18 Standard deviation (s) = 6 Significance…

Q: Which of the following will DECREASE the width of a confidence interval for a population proportion,…

A: Formula for the confidence interval for the proportion of the population is as follows…

Q: A sample with 45 observations is taken. The mean is found to be 25, while the population standard…

A:

Q: 1. The strength of a fiber is normally distributed with a known population standard deviation of 12…

A: Here since the population standard deviation is given we use the Z value for the computation of…

Q: ample mean of 62.2 was found and a 95% confidence interval of (57.3, 67.1) was also found. What is…

A: The sample mean for the  population is 62.2  . Confidence interval is (57.3 , 67.1)

Q: A simple random sample with n=54 provided a sample mean of 22.5 and a sample standard deviation of…

A: Given,   Sample size = 54 Sample mean = 22.5 Sample standard deviation = 4.4   Since the population…

Q: In a sample of 7 observations, the values are 17, 11, 12, 13, 14, 15, 16. Find the 95% confidence…

A:

Q: 79. What is the 90% confidence interval for the difference in population proportions, p1 – p2 ,…

A: given data p^1 = 0.40   n1 = 144p^2 = 0.38     n2 = 16990% ci for p1-p2.

Q: Assum a sample is used to estimate a populatation mean.  Find the 95% confidence interval for a…

A: Given :  a sample size of 41 with a mean of 64.2 and a standard deviation of 13.4 Sample Mean…

Q: A random sample of 500 observations yields x̅ =400 and s=50. What is the  95% confidence interval…

A:

Q: Suppose the population standard deviation is = 5, an SRS of n = 100 is obtained, and the confidence…

A:

Q: A sample of 64 is taken from a population, with the mean of the sample being 119 and the standard…

A: Option B is correct (113, 125)

Q: 2.2% is your desired margin of error in percentage points. Find the sample size required to develop…

A: Proportion value p is not provided but as is the norm, we will assume p =0.5.