A bank wishes to estimate the mean credit card balance owed by its customers. The population standard deviation is estimated to be $300. If a 98% confidence interval is used and an margin of error of $91 is desired, how many customers should be sampled?   Multiple Choice   16   156   405   59

Q: In estimating the population mean with the population standard deviation unknown, if the sample size…

A: Given that, Population standard deviation is unknown and sample size (n) = 27

Q: a successful basketball player has a height of 6 feet 9 inches, or 206 cm. Based on statistics from…

A: Given,           Z -score=4.45           A basket ball player has a height of  6 feet 9…

Q: n this scenario, what is the test statistic? A linguist believes the average age children learn a…

A: Given: n= 21.0 ,x̄= 9.2 ,s= 2.5 µ= 10.0 ,degree of freedom= 20.0

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: Given : A professor believes that, for the introductory art history classes at his university, the…

Q: A customer at a specialty coffee shop observed the amount of time, in minutes, that each of 20…

A: Given data, 3.2,4,3.9,2.4,4.7,5,4.5,3.5,3.4,6.1,3.4,5,4.6,4.9,2.9,3.5,2.2,3.9,5.4,3

Q: A telephone company wants to estimate the mean number of minutes people in a city spend talking long…

A:

Q: If you wanted your study to have a smaller standard error, which of these would be a good idea?…

A:

Q: A data set has a mean of 60.4 and a standard deviation of 5.2    Is a value of 45 unusual? Is a…

A: From the provided information, Mean (µ) = 60.4 Standard deviation (σ) = 5.2 X~N (60.4, 5.2)

Q: For the United States, the mean monthly Internet bill is $32.79 per household (CNBC,  January 18,…

A: Given  μ=32.79 n=50, x̄=30.63, σ=5.60

Q: A professor is trying to find the average exam grade in his class. The sample mean should be within…

A: Determine the value of sample size n. The value of sample size n is obtained as shown below: Use…

Q: An employer claims that full time employees have a mean income of $35,000. A sample of 200 employees…

A: From the provided information, Sample size (n) = 200 Sample mean (x̅) = $34000 Population standard…

Q: Find the margin of error for the following; 95% confidence, sample mean is 32.5, standard deviation…

A:

Q: The length of a fully grown hibiscus plant has a mean 35cm. It is found that 5% of these plants are…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: 3. Given the sample variance of a distribution, explain how to find the standard deviation.

A: Variance is the measure of dispersion that calculates the average of the squared difference from the…

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

A: From the provided information,

Q: A) What formula do you need to use for this calculation B) what is the mean of the sample? c. What…

A: GivenMean(x)=142standard deviation(σ)=8sample size(n)=400

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: Sample mean (x̅1) = 79.5Sample mean (x̅2) = 80.7Sample size (n1) = 200Sample size (n2) = 250Standard…

Q: An editor wants to estimate average the number of pages in bestselling novels, so that his estimate…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: According to the IRS, the average refund in the 2011 tax year was $3,109. Assuming that the standard…

A: Given information- Sample size (n) = 50 Population Mean µ = $3,109 Standard deviation (σ) = $874

Q: A football coach claims that the average weight of all the opposing teams’ members is 210 pounds.…

A: Consider that μ is the true average weight of all the opposing teams’ members.

Q: Use a formula to find the standard deviation of the sample 1, 4, 5, 6.

A: We have given that,  The data set of the sample is,  1, 4, 5, 6 Then,  We will find the standard…

Q: a. If we want to estimate the population mean time for previews at movie theaters with a margin of…

A:

Q: Which test statistic will be used if the sample is 37? a. t-test b. z-test c. population mean d.…

A: We have given that,  Which test statistic will be used if the sample is 37? Here, sample size (n) =…

Q: A sociologist found that in a sample of 50 retired men, the average number of jobs they had during…

A:

Q: The manager of a grocery store has taken a random sample of 100 customers. The average length of…

A: Solution: Let X be the waiting time. From the given information, n=100, x-bar=3.1 minutes and σ= 0.5…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.6 pounds per year. A sample of…

A: Given, A nutritionist claims that the mean tuna consumption by a person is 3.6 pounds per year. A…

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: Given Data : For evining classes x̄1 = 85.6 σ1 = 4.6 n1 = 250 For…

Q: Sixty eight percent of German workers say they have a bad manager. Consider a random sample of 50…

A: Sixty eight percent of German workers say they have a bad manager. Consider a random sample of 50…

Q: What is the minimum sample size that would guarantee that the margin of error is less than or equal…

A: The population standard deviation is given by 2000 And the required margin of error is less than or…

Q: The annual earnings​ (in dollars) of 35 randomly selected microbiologists are shown in the data…

A: Given information: The annual earnings (in dollars) of n = 35 randomly selected microbiologists are…

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

A: We have given that  simple random sample of 50 City A residents the mean is 22.6 miles a day and the…

Q: nousc 12.73 (M3, M4, M5, P1) How much money do people spend on graduation gifts? In 2016, the…

A: Given data normally distributed with mean of $53.73, sample standard deviation of $20 and sample…

Q: A researcher wishes to estimate within $20 the average cost of postage a community college spends in…

A: GivenMargin of error(E)=20standard deviation(σ)=60confidence level = 90%

Q: A population mean is 13. The sample mean is 12.8, and the sample standard deviation is 2. The sample…

A: Solution: From the given information, n=20 and S=2. The standard error would be used to conduct a…

Q: A light bulb manufacturer wants to determine how large a sample is needed to test the hours a light…

A: Given data,sd σ=300E=25z-value at 99% confidence is Zc=2.576n=?

Q: Allan, a Grade 12 senior high school student, wants to estimate the average number of students who…

A:

Q: manager of a major retail store has taken a random sample of 25 customers. The average sale was…

A: From the given information we conduct t test for one mean.

Q: The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age…

A: Given data Error = 0.02 Confidence level = 0.95

Q: 12.What is the sample size needed if the margin of error is 30 and the standard deviation of 45 with…

A: (12)  We have given that,  Confidence level (C.I) = 98% , standard deviation (σ) = 45 and margin of…

Q: An instructor claims that the average number of hours needed to study for a final exam in order to…

A: The significance test for single mean is tested using the z test, if the population standard…

Q: A Research sampled 50 doctors to obtain a mean of 145,580 pesos, and standard deviation of 13,200…

A: given   sample size 50  mean =145580 standard deviation =13200 the 95% confidence interval Z score…

Q: Suppose we wish to study the average income of Cactus Club customers, so we plan to conduct a…

A:

Q: The college board reports that in a recent year, the mean mathematics SAT score was 514, and the…

A:

Q: Given a sample data set with a Variance of 6.25, what is the Standard Deviation of the data set.?

A:

Q: eBook The U.S. Energy Information Administration (US EIA) reported that the average price for a…

A:

Q: The average speed of 64 random cars traveling on a certain highway was 80 km/h and the sample…

A: We have given that,  Average speed (x̄) = 80 , standard deviation    (s) = 20, Confidence level(C.I)…

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: Given Data : For evining classes x̄1 = 85.6 σ1 = 4.6 n1 = 250 For…

Q: A bank wishes to estimate the mean credit card balance owed by its customers. The population…

A: We have to find sample size ....

Q: A college admissions officer believes that students enrolling from Shawnee school District have…

A: Solution: Given information: n1=30 Sample size of Shawnee school Districtn2=30 Sample size of West…

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.