A random sample of 50 employees is chosen from a company. The average salary of the 50 employees is $55,000 and the standard deviation is $5,000. Find a 95% confidence interval for the average salary of the entire company. (Type numhers in

Q: A 95% confidence interval for the proportion of cars on the road in the Germany that have automatic…

A: The 95% confidence interval for the proportion of cars on the road in the Country G that have…

Q: In a random sample of seven people, the mean driving distance to work was 25.5 miles and the…

A: Given: Xˉ=25.5 s=5.7 n=7  The degrees of freedom is, DF = n-1=7-1=6 The critical value t for 0.05…

Q: From a random sample of 49 high school seniors, the sample mean and standard deviation of the math…

A:

Q: Determine the value of z, that would be used in constructing a 90%confidence interval for a 2.…

A: Z = x-μσ, Where μ = population mean,           σ = population variance,           x = observed…

Q: sample of 352 subscribers to Wired magazine shows the mean time spent using the Internet is 18.4…

A: Given data,n=352x=18.4s=6.8α=0.05df=n-1=351t-critical value is tc=1.967

Q: From a simple random sample of 400 of the 1,395 colleges in our population, it was found that…

A: Given : 1395 colleges in our population  Population Size (N) = 1395 400 colleges selected randomly…

Q: A sample of 40 cows is drawn to estimate the mean weight of a large herd of cattle. If the standard…

A:

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: Given,sample size(n)=64sample mean(x)=90standard deviation(s)=7degrees of…

Q: In a random sample of 27 ​people, the mean commute time to work was 33.3 minutes and the standard…

A:

Q: In a study investigating the average salaries of employees in a company, 36 employees of the company…

A: Solution: Given information: n=36 Sample size  x=2400  Sample mean s= 1200 Sample standard deviation…

Q: A tire producer wants to test whether the mean diameter of the tires produced on a given day equals…

A: Given Information: Sample size (n) = 48  Mean Diameter (u) = 36.4 inches Standard Deviation (s) =…

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A random sample of 25 four-person families visiting New Orleans was selected, and the average amount…

A: From the provided information, Sample size (n) = 25 Sample mean (x̅) = $724.00 Sample standard…

Q: Find the 95% confidence interval for the mean score of all such subjects. Round to one decimal…

A: Given : n=27 , X-bar=76.2  , s=21.4  , α=0.05 Since , the population standard deviation (σ) is…

Q: A random sample of 240 adults over the age of 40 found that 144 would use an online dating service.…

A:

Q: The local police department attempted to estimate average vehicle speeds along a strip of Main…

A: Standard error- is the standard deviation of its sampling distribution or an estimate of that…

Q: A sample of 352 subscribers to Wired magazine shows the mean time spent using the Internet is 18.4…

A: Given -  Sample size, n = 352 Mean time spent, x=18.4 hoursStandard deviation, σ=6.8 hours

Q: In a random sample of 20 days, a newspaper dealer sold on the average 345 newspapers per day with a…

A: X̄ = 345 n = 20, σ = 20

Q: In a sample of 100 patients that did not receive the flu shot, the average recovery time after being…

A: Confidence interval is an inference process which is used to estimate the population parameter. The…

Q: Suppose a sample of 30 LCC students are given an IQ test. The sample has a standard deviation of…

A: Given the following information- n=30s=12.24s2=149.82

Q: Consider a group of 27 patients in an experiment who received a placebo. At the beginning of the…

A:

Q: Calculate a 90% confidence interval for the mean of the population, supposed normal, from which…

A: Given, Heights 63 63 66 67 68 69 70 70 71 71 Let X be height of  animal…

Q: Construct a 95% confidence interval for the true average monthly salary earned by all employees of…

A: From the given information, Sample size n =19 Sample mean, x̅=18,500 Sample standard deviation,…

Q: An investigator computes a 95% confidence interval for a population mean on the basis of a sample of…

A: To find half of width, We need to calculate 4 times the sample Size.

Q: In a random sample of seven cell​ phones, the mean full retail price was $477.50 and the standard…

A: Obtain the margin of error at the 99% confidence interval. The margin of error at the 99% confidence…

Q: in a random sample of 192 college students, 129 had part-time jobs. Find the margin of error for the…

A:

Q: Construct a 95% confidence interval for the true average monthly salary earned by all employees of…

A:

Q: A recent study of 19 students of San Sebastian College-Recoletos, Manila showed that the mean of the…

A:

Q: A random sample of 80 customers, who visited a department store, spent an average of $75 at this…

A: Solution: Given information: n= 80 Sample size x= $75  Sample mean σ= $16 Population standard…

Q: If a school district takes a random sample of 66 Math SAT scores and finds that the average is 480,…

A:

Q: The mean and standard deviation of a random sample of 7 baby orca whales were calculated as 430…

A: Solution: Let X be the weight of all baby orca whales. From the given information, x-bar=430, S=26.9…

Q: for a sample of 57 that has a mean of 6200 and a standard deviation of 254, calculate the 95%…

A:

Q: On a particular day a consumer-advice bureau received 125 calls. For a random sample of 40 of these…

A: Given:   Population size: N=125 Sample size: n=40 Sample mean: x¯=7.28 Sample standard deviation:…

Q: The dollar value of orders placed through a particular store catalog is found to be normally…

A: Given,S.D(σ)= $21.58Mean (X¯) =$81.25Sample Size(n)=30α=1-0.90α=0.1α2=0.05z0.05=1.645

Q: Taking a random sample of 35 individuals waiting to be serviced by the teller, we find that the mean…

A:

Q: The mean time it takes for a random sample of 758 airplanes to fly from Florida to New York was…

A: Determine the confidence interval for the considered mean time by using the formula: 95% Confidence…

Q: A simple random sample of 5 observations from a normal distribution was taken, and the following…

A:

Q: In a random sample of 250 students who enrolled in Science, 150 took notes during classes. Find an…

A: Given that n=250,x =150,alpha =0.05 Find an approximate 95% confidence interval for the population…

Q: A sample from a normal population is given with mean 54 and the standard deviation 12. Find the…

A: Given : n = 25 x¯=54 S = 12

Q: On the Stanford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a…

A: Given  population mean μ=100, n=sample size=21, sample mean x̄=92, sample standard deviations s=6.92…

Q: Find the 95% confidence interval for the variance and standard deviation of the heights of maple…

A: Construct the 95% confidence interval for the variance. Obtain the critical values. The standard…

Q: The cell phone conversations of a random sample of 50 students has a standard deviation of 9.7…

A: Given: n=50σ=9.7CI=90%=0.90

Q: Given that you have a sample size of 10 different soda pops, with a sample mean of 2.228 and a…

A: The provided information are:

Q: From a random sample of 24 months from January 2006 through December 2016, the mean number of…

A: x¯=100σ=114n=24Confidence interval = 90%

Q: A wildlife study is designed to find the mean weight of salmon caught by an Alaskan fishing company.…

A:

Q: An airline transports over 10 000 passengers daily, and the airline is curious what proportion of…

A: Critical value: Using Excel formula "=NORM.S.INV(1-(0.1/2))", the z-value is obtained as 1.645.

Q: Construct a 99% confidence interval for the population standard deviation σ if a sample of size 11…

A: Confidence Interval: A confidence interval, in statistics, refers to the probability that a…

Q: A random sample of 32 showed that the mean shoe size for American men is 10.5 with a standard…

A: Given that: n= 32.0 , x̄= 10.5 s= 1.12 At 95.0 % confidence level , z score= 1.96

Q: The average weight of 35 randomly selected compact automobiles was 2680 pounds. The sample standard…

A: From the provided information, Sample size (n) = 61 Sample mean (x̅) = 2680 Sample standard…

Q: Construct a 99% confidence interval for the population standard deviation σ if a sample of size 8…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by: