The makers of a soft drink want to identify the average age of its consumers. A sample of 55 consumers was taken. The average age in the sample

Q: A sports shop selects a random sample and records the sales of items made in China and those made in…

A:

Q: A sample of ?=25 diners at a local restaurant had a mean lunch bill of $16 with a standard deviation…

A: From the provided information, Sample size (n) = 25 Standard deviation (σ) = $5 Confidence level =…

Q: If the population standard deviation is known to be 4.7 hours, and a random sample of 35 analysts…

A: Given that Sample size n = 35 Sample mean = 50.5 Population SD = 4.7 The critical value of Z at 90%…

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: An environmental science teacher at a high school with a large population of students wanted to…

A: The 95% confidence interval for the proportion of all students at the school who would respond yes…

Q: A sample of 200 corporate managers produced the mean job-related stress score of 7.9 with a standard…

A: It is given that,

Q: Determine the sample size needed to construct a 95% confidence interval for the population mean, μ,…

A:

Q: Given that the population standard deviation is σ = 1, determine the minimum sample size needed in…

A: Solution Refer Standard normal table/Z-table OR use excel function…

Q: A random sample of 51 four-year-olds attending day care centers provided a yearly tuition average of…

A:

Q: find the t/α2 value for an 85% confidence interval for the mean when the sample size is 12

A: We have to find correct answer..

Q: For a fixed sample size, what happens to a confidence interval for u when we increase the level of…

A: Given that for a fixed sample size.  We have to find what happens to a confidence interval for mu…

Q: Dunkin Bucks is interested in the number of cups of coffee their adults customers drink per day…

A: Given,   N Average Standard deviation Adults 75 1.8 0.6 Teenagers 75 1.3 0.3

Q: A major department store chain is interested in estimating the mean amount its credit card customers…

A: Solution: Let X be the amount its credit card customers spent on their first visit to the chains new…

Q: Find the critical value, t c,  used for a 95% confidence interval for the mean with a sample size of…

A:

Q: In the 2018 GSS, a random sample of 1419 adults were asked how many hours per week they usually…

A: Given Data : Sample Size, n = 1419.0 Sample Mean, x̄ = 7.15 standard…

Q: The Indian River County Health Department needs to estimate the proportion of county residents with…

A: It is given that the sample size (n) is 1507 and x is 672.

Q: A sports shop records the sales of items made in China and those made in America. Country of…

A:

Q: If the sample mean is 70 and the standard error of the sample mean is 8, what will be the 90%…

A:

Q: A bank officer wants to determine the amount of the average total monthly deposits per customer at…

A: Given,   Margin of error = 200 Standard deviation = 1000   Critical value: Using z-table, the…

Q: Is the margin of error for a confidence interval for a population equivalent to the standard…

A: The margin of error for a confidence interval when population standard deviation is known, The…

Q: Use The t Distribution Table to find the t/α2 value for a 98% confidence interval for the mean when…

A: Given that n = 17 Degrees of freedom = df = n - 1 = 17 - 1 = 16 t/α2 value for a 98% confidence…

Q: Find the critical value, t c,  used for a 90% confidence interval for the mean with a sample size of…

A: The confidence level is, 100 (1 – α) % = 90%. Hence, (1 – α) = 0.90, and the significance level is,…

Q: 1) In an effort to estimate the mean amount spent per customer at Oliver's Eatery in Astoria,…

A: As per the honor code, We’ll answer the first question since the exact one wasn’t specified. Please…

Q: In a random sample of 8 cell​ phones, the mean full retail price was $539.00 and the standard…

A: From the available information,   The confidence interval is, C=90%=90/100=0.90 The level of…

Q: D. The temperature readings for 20 days in Sydney are normally distributed with a mean of 5.5°C and…

A:

Q: A department store chain is interested in estimating the mean amount its credit card customers spent…

A: Conditions for using standard normal distribution to construct confidence interval for population…

Q: In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager…

A: Given: s = $12.30  n = 100

Q: For a given sample, a 50% confidence terval for the population mean is narrower than a 90%…

A: For  a given sample size and population standard deviation, the interval estimation of the…

Q: An environmental science teacher at a high school with a large population of students wanted to…

A: Given information: To obtain a potentially less biased estimate of the proportion, a statistics…

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

A:

Q: The following information was retrieved from Tennessee Valley Authority system on dissolved oxygen…

A: Given,   Sample size = 20 Sample mean = 3.856 Sample standard deviation = 2.024   Since the…

Q: or a sample of 121 that has a mean of 6540 and a standard deviation of 780, calculate the 90%…

A:

Q: Suppose a random sample of 48 apartments in Toronto was selected and their square footage were…

A: Introduction: A histogram for the apartment sizes in a sample of 48 apartments is given.

Q: Find the length of a 99% confidence interval for the mean of the sample with a standard deviation of…

A: We have given that the confidence interval 99% for the mean of the sample with a standard deviation…

Q: An environmental science teacher at a high school with a large population of students wanted to…

A: Question : (b) Given the method used by the environmental science teacher to collect the responses,…

Q: n a crash test of 15 troopers, collision repair costs are found to have a distribution that is…

A: The summary of the statistics is, x¯=1800,s=950,n=15 The degree of freedom is, df =n -1     =15-1…

Q: A sport shop selects a random sample and record sales of items made in China and those made in…

A: Given: China n=50x¯=22.5s=9.75 America n=33x¯=33.15s=11.6

Q: In a random sample of twelve ​people, the mean driving distance to work was 18.8 miles and the…

A: From the given information we want to construct 90% confidence interval.

Q: If the sample mean is 70 and the standard error of the sample mean is 8, what will be the 90%…

A:

Q: Use The t Distribution Table to find the t2 value for a 98% confidence interval for the mean when…

A: Obtain the degrees of freedom.   The degrees of freedom is obtained below as follows:   From the…

Q: If n=25 and the sample standard deviation is 15, construct a 95% confidence interval for the true…

A: The confidence interval is used to estimate the population parameter with the help of a sample…

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: he following stemplot shows the swimming speeds, in kilometers per hour  (km/h), for a random sample…

A: xbar = 9.771 s = 0.944 n = 31

Q: For a group of 10 men subjected to a stress situation, the mean number of heart beats per minute was…

A:

Q: A cell phone company claims that the average time a person spends on their phone is 12.8 hours a…

A: It is given that the average time spent on phone is 12.2 hours per week and standard deviation is…

Q: The manager of a pizza shop finds that the delivery time of pizza to customer follows a normal…

A:

Q: single burger contains a mean of 100 g of cooked beef with a standard deviation of 5 g. The…

A:

Q: A study of a local city is being conducted to find out the average number of people that use public…

A: It is given that confidence level is 0.90, standard deviation is 100 and margin of error E is 11.

Q: For a fixed sample size, what happens to a confidence interval for u when we increase the level of…

A: Here we need to determine whether the width of the confidence interval becomes narrower or wider…

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.