A paint manufacturer wants to determine the average drying time of a new interior wall paint. If for 12 test areas of equal size he obtained a mean drying time of 66.3 minutes and a standard deviation of 8.4 minutes. Assume that the sample comes from normal population. The 95% confidence interval for the true mean u O a. (61 , 69) O b. (65.2 , 72) O c. (61, 71.6) O d. (59, 71.8)

Q: An automobile rental agency has the following mileages (in thousands) for a simple random sample of…

A: Given; Sample standard deviation(s)=4.12 Sample size(n)=25 Level of significance (α)=0.1…

Q: The operator of a nuclear power plant requires fuel rods to have a mean percentage of enrichment of…

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Q: Suppose, according to a 1990 demographic report, the average U. S. household spends $90 per day.…

A: Sample mean = $84.5.Sample standard deviation, s is $14.5.The sample size, n is 30.

Q: A quality control manager wants to be sure that the standard deviation of oil containers is below a…

A: Let Xi be the amount of oil in the ith container,i=1,2,...,n.

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

A: Given information Standard deviation σ= 2.10 Confidence interval = 0.95 Significance level(α) = 1-…

Q: For a fixed value of the standard deviation, a 95% confidence interval on the population mean will…

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

A: Given that, Population mean=μ=12.8 Hours Sample mean=X Bar=12.2 Hours Sample standard deviation= 2.3…

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

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Q: In an examination of purchasing patterns of shoppers, a sample of 16 shoppers revealed that they…

A: From the given information, sample mean, x̅=54 Population standard deviation, σ=21 Sample size n =16…

Q: In a random sample of nine people, the mean driving distance to work was 25 miles the sample…

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

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

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

A: The provided information is: Sample meanx¯=12.20 Population standard deviationσ=2.30 Level of…

Q: Assume that six samples of pesticide concentrations in Ohio plants are gathered, yielding  a sample…

A: Given, S = 4.3x¯ = 28.2n = 6     To find, a) 50% confidence interval for mean? b) Interpretation c)…

Q: A college admissions officer takes a simple random sample of 96 entering freshmen and computes their…

A: We have to find out lower confidence interval...

Q: In a random sample of 12 people, the mean commute time to work was 30 minutes and the sample…

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Q: A weekly tabloid reported that the average income of its subscribers is $39,100. Assume this…

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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: 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: In a random sample of ten people, the mean driving distance to work was 21.8 miles and the standard…

A: Given,sample size(n)=10mean(x)=21.8standard deviation(σ)=6.4α=1-0.99=0.01α2=0.005degrees of…

Q: Find the sample size necessary for an 80% confidence level with a maximal margin of error E= 0.07…

A: Given that s.d =0.34,alpha =0.2,E =0.07 ( e) n= ?

Q: A survey of 31 accountants shows the average salary is $65,000 with a population std deviation of…

A: Given : Sample size, n= 31 Mean = $65000 Population standard deviation = 7000

Q: A company wants to estimate the mean time (in hours) per week for an adult who uses computers at…

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Q: According to the International Journal of Retail and Distribution Management(Vol. 39, 2011) survey…

A: Given, Margin error (E) = 0.25 Standard deviation = 1.41   The objective is to find the sample.…

Q: In a study on college dropout rates, researchers found one factor that influenced the decision to…

A: We have given that,  Sample mean (x̄) = 3.11, standard deviation (s) = 0.66 and sample size (n) =…

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: A survey of 1,917 cell phone users in May 2010 asked "on an average day, about how many cell phone…

A: #  Given,  n=1917     μ=13.10      &    σ=10.2a  standard  error=σn=10.21917=0.23296

Q: In a random sample of eleven people, the mean driving distance to work was 25.7 miles and the…

A: Given that, n=no. of sample=11 x=mean=25.7 s=standard deviation=4.1 Confidence interval is 99%

Q: In a survey to estimate the mean time spent by office workers per day checking for and sending out…

A: From the provided information, Sample size (n) = 30 Sample mean (x̅) = 2 hours or 120 minutes…

Q: According to NEA Advocate (2007), the averages for the 2005-2006 academic year, 34 CSU Stanislaus…

A: The provided information is x¯1=$65800x¯2=$72400σ1=$12000σ2=$8000n1=34n2=40α=0.05 The critical value…

Q: If the mean flying time for a sample of 65 pilots was 15.6 hours per month, and the population…

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

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Q: How large a sample should be selected to provide a 99% confidence interval with a margin of error of…

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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: Two sets of chromium analyses were performed on water samples from a stream that runs near a…

A: Given: Two sets of chromium analyses were performed on water samples from a stream that runs near a…

Q: Find the error bound for an unknown population mean or the margin of error that corresponds to a 85%…

A: Find the error bound for an unknown population mean or the margin of error that corresponds to a 85%…

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: average expenditure per student (based on average daily attendance) for a certain school year was…

A: Define the Null and alternative hypotheses:   Null Hypothesis:    H0: µ = 10,337.   Alternate…

Q: How large a sample should be selected to provide a 99% confidence interval with a margin of error of…

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Q: How much money does the average professional football fan spend on food at a single football game?…

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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: In a random sample of 50 people, the mean body mass index (BMI) was 27.7 and the standard deviation…

A: Given that the sample size is 50, the mean is 27.7 and the standard deviation is 6.12 a) Confidence…

Q: 1) An electronic manufacturer produces lampshades with a life span of approximately normally…

A: Given: standard deviation(σ)=35

Q: In a recent study of 42 eighth graders, the mean number of hours per week that they watched…

A: We are required to estimate the interval for the TV watching hours per week from the given sample of…

Q: In a random sample of eleven ​people, the mean driving distance to work was 18.1 miles and the…

A: Given information Sample size (n) = 11 Sample mean x̅ = 18.1 miles Standard deviation (s) = 7.6…

Q: A large city newspaper periodically reports the mean cost of dinner for two people at restaurants in…

A: Determine the sample size n needed. Here, confidence level is 0.95. Use EXCEL Procedure for…

Q: In a sample of 100 steel canisters, the mean wall thickness was 8.1 mm with a standard deviation of…

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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…

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.