QUESTION 2 You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 90 items resulted in a sample mean of 60. The population standard deviation is ? = 10. (a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) to (b) Assume that the same sample mean was obtained from a sample of 180 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.) to (c) What is the effect of a larger sample size on the interval estimate? A larger sample size does not change the margin of error.A larger sample size provides a larger margin of error.     A larger sample size provides a smaller margin of error.

Q: You measure 39 dogs' weights, and find they have a mean weight of 49 ounces. Assume the population…

A: Given,sample size(n)=39sample mean(x¯)=49standard deviation(σ)=6.8α=1-0.99=0.01α2=0.005Z0.005=2.58…

Q: A recent study of a very large number of parents on cyberbullying showed that a 95% confidence…

A: Given data,For 95% CILower limit=0.1238Upper limit =0.2036Proportion (p)=?

Q: You measure 20 dogs weights and find they have a mean weight of 48 pounds. Assume the population…

A:

Q: The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash…

A:

Q: ch.8 confidence interval mean question 2 Karen wants to advertise how many chocolate chips are in…

A:

Q: You may need to use the appropriate appendix table technology to answer this question. A 95%…

A: Assume that μ is the population mean.

Q: You will be applying what you have learned in this course by gathering data and running a…

A: C) Here X¯=66.78 and σ=4.5 C.I. = X¯±z×12σn C.I. = 66.78 ± 1.96 ×4.59 C.I. = 66.78 ± 2.94  C.I. =…

Q: Construct a confidence interval of the population proportion at the given level of confidence. x=…

A: Given :  x = 860 n = 1100 Confidence level = 96%

Q: Question 4 You have taken 10 observations from normally distributed data that is known to have a…

A: Given data: Population standard deviation = 1 Sample size = 10 Sample mean = 32 To calculate  the…

Q: You measure 45 textbooks' weights, and find they have a mean weight of 31 ounces. Assume the…

A: Obtain the 99% confidence interval for the true population mean text book weight. The 99% confidence…

Q: Out of 100 people sampled, 6 had kids. Based on this, construct a 95% confidence interval for the…

A: The random variable people with kids follow binomial distribution. The sample size is 100. The…

Q: Now that you have looked at the descriptive side of the regression analysis, let's turn to what…

A: Here we have given the regression output of the regression analysis of happiness score on life…

Q: Calculate the lower 95% confidence interval for the population mean. (round to the nearest tenth)…

A: From the provided information, n=31x=56σ2=15 Confidence level = 95%

Q: You may need to use the appropriate appendix table or technology to answer this question. A simple…

A: a.Degrees of freedom:The critical value is obtained by using Excel function “=TINV(probability,…

Q: A sample of the reading scores of 30 fifth graders has mean of 62.the standard deviation of the…

A: Given,   Sample size = 30 Sample mean = 62 Population standard deviation = 15   The objective is to…

Q: Question is below and the data is attached: The amounts of a chemical compound y that dissolved in…

A: a) Confidence interval for the average amount of chemical at  50∘Cgiven the fitted regression…

Q: you want to obtain a sample to estimate a population mean. based on previous evidence, you believe…

A:

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given95% confidence interval N=361 x = 59.1 seconds. z= 4.9 SecondsFind the margin of error?

Q: If n = 570 and X = 456, construct a 90% confidence interval for the population proportion, p.Give…

A:

Q: question 2 A simple random sample of 70 items from a population with  7 resulted in a sample mean…

A: The given data is as follows:Sample size, Population standard deviation, Sample mean,

Q: You measure 37 textbooks' weights, and find they have a mean weight of 74 ounces. Assume the…

A: Sample size = 37Mean = 74Standard deviation = 11.899% confidence level

Q: You measure 37 textbooks' weights, and find they have a mean weight of 46 ounces. Assume the…

A: Question 5: The sample size is 37, mean is 46 ounces, and population mean is 9.3 ounces. Computation…

Q: If n = 28, = 38, and s 17, construct a confidence interval at a 99% confidence level. Assume the…

A: Given information- Sample size, n = 28 Significance level, α = 0.01 Sample mean, x-bar = 38 Sample…

Q: Many people believe that the average number of Facebook friends is 140. The population standard…

A: The population standard deviation is given as 37.9 The sample size n= 39 The sample mean x¯ = 152

Q: You are given the sample mean and the population standard deviation. Use this information to…

A: We have to interprete ci.

Q: Ex let x be with pmf 1=,2,3, 16 O find c P(X)2)

A: We want to find the value of c and P(X≥2) and P(X2=9)= ?

Q: Population and Sample Standard Deviations. You examine the numerical relationship between the…

A: a) The formula used to compute population standard deviation, σ is, Where m is the size of the data…

Q: Which of the following would result in the widest confidence interval? A sample size of 100 with 99%…

A: Given that  Confidence level = 95%, 99% Sample size = 100, 30

Q: Question 9: A study was run to determine the proportion of adults that feel sleep-deprived. A 95%…

A: Given that, a study was run to determine the proportion of adults that feel sleep-deprived. A 95%…

Q: There is no difference(s) between an interval estimate and a confidence interval estimate. If true ,…

A: We can make only two types of estimates about the population. 1. Point estimate = A single value…

Q: Question # 5. The heights of men in Saudi Arabia are presumed to be normally distributed. You…

A: It is given that  Sample mean = 167 Population standard deviation = 7.5 Sample size = 150

Q: If a school district takes a random sample of 61 Math SAT scores and finds that the average is 425,…

A:

Q: If X=116, o = 26, and n=32, construct a 95% confidence interval estimate of the population mean, u.…

A: Given: n= 32.0 , x̄= 116.0 σ= 26.0 At 95.0 % confidence level , z score= 1.96

Q: The weight (in lb) of widgets produced in a factory is right-skewed. A random sample of 36 widgets…

A: Given that, The sample size  n=36 The confidence level is 95% The confidence interval CI=(6.90,7.55)…

Q: Suppose you randomly sample 25 cans and find the mean amount of Coke in this sample is 11.85 ounces…

A: As per our guidelines I can solve only first three subparts. Kindly post the remaining subpart again…

Q: #1-3: In a hospital, two different departments give surveys to measure the satisfaction of patients.…

A: Degrees of freedom in this case is given by nA-1 = 125-1 = 124 For department A the 99% CI is given…

Q: You are given the sample mean and the population standard deviation. Use this information to…

A: The 90% confidence interval is (62.27, 129.73).Explanation:(1−α)100% confidence interval for μ will…

Q: 6. A sample of 15 students was used to estimate the performance of graduates of a certain college on…

A: Given : A sample of 15 student's was used to estimate the performance of graduates of a certain…

Q: If n = 20, the sample mean = 250, SD = 15, SEM = 3.354, what is the confidence interval (using 95%…

A: The formula for a confidence interval for the population mean μ\mu when the population standard…

Q: One year, the mean age of an inmate on death row was 41.5 years. A sociologist wondered whether the…

A: Sample size (n) = 32Sample mean (x̅) = 40.2Standard deviations (s) = 9.1Significance level (α) = 1…

Q: Part 1 of 3  A researcher was investigating the size of math departments in Texas colleges. She…

A: Part 1: Suppose that µ is the population mean size of math departments in Texas colleges.

Q: You are given the sample mean and the population standard deviation. Use this information to…

A:

Q: You measure 30 watermelons' weights, and find they have a mean weight of 79 ounces. Assume the…

A: Mean =79Standard deviation = 13.7Sample size = 3099% confidence level

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.