ge number of sick days that an employee takes per year is believed to be 10. The human resource department of a local company does not believe this to be the case at their company. They randomly survey 8 employees who took sick days over the past year and find the following: 12, 4, 15, 3, 11, 8, 6, 8. Should the HR department believe the mean number of days is 10? What are the confidence intervals?

Q: The Diabetic Association of Pakistan sampled 4900 severely overweight Pakistanis between 20 and 59…

A: Given,sample size(n)=4900sample proportion(p^)=0.171-p^=1-0.17=0.83α=1-0.95=0.05α2=0.025Z0.025=1.96…

Q: In a service system at a bank, a sample of 40 customers is taken and the average waiting time is 12…

A: GivenMean(x)=12standard deviation(s)=2.4sample size(n)=40

Q: A senior manager, responsible for a group of 120 junior executives, is interested in the total…

A: It is given that sample members spent a total of 143 hours and the sample size n is 35.

Q: Consider a sample of 8 hypertensive smoking adults. Their serum cholesterol level readings are as…

A: Margin of error of a point estimate provides the extent of accuracy with which the value of the…

Q: In the order of estimate the average waiting time in outpatient clinic at Princes Basma hospital,…

A:

Q: 2. The heights of a random sample of 50 Senior High School students showed a mean of 174.5…

A: Given that x̄ =174.5 , S=6.9 , n = 50

Q: question is pictured

A: From the provided information,

Q: Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests.”   The…

A: Formula for the sample size needed to estimate a population proportion is

Q: 2. The heights of a random sample of 50 college students showed a mean of 174.5 centimeters and a…

A: From the provided information, Sample size (n) = 50 Sample mean (x̄) = 174.5 Standard deviation (s)…

Q: In a test of physical fitness, a fitness trainer for a group of men ages 65 and older from a local…

A: Given that :  A group of men ages 65 and older told  16 men to do as many sits - ups as they could.…

Q: One measure of physical fitness is the amount of time it takes for the pulse rate to return to…

A: X=16.5n=20S=3.55CI will be X±tα2,n-1*Sn

Q: 1. Out of 1,500 licensed drivers, 900 admitted that they do not like to drive at night. What is the…

A: *As per company guidelines,  we are supposed to only answer 3 subparts. For next parts kindly…

Q: A corporation that maintains a large fleet of company cars for the use of its sales staff is…

A: Number of samples (n) = 10 2013 -273 74529 2226 -60 3600 2561 275 75625 1872 -414…

Q: When 38 campers are randomly selected and surveyed, it was found that the average number that prefer…

A: The summary of statistics is, x¯=24,σ=10.7,n=38 Critical values: By using the z-tables, the critical…

Q: The lead levels in a random sample of 35 crows in the region were measured and recorded. The mean…

A:

Q: In a random sample of seven people, the mean driving distance to work was 19.7 miles and the st and…

A: From provided information, random sample of 7 people is considered. The mean distance to work was…

Q: Construct a 95% confidence interval containing the population mean of the height of giraffes if a…

A: We want to find the 95% CI for population mean μ

Q: Find the critical t value to use in making a 98% confidence interval for a mean if the sample size…

A:

Q: A sample of 35 different payroll departments found that employees worked an average of 240.6 days a…

A: Given that  Sample size (n) =35 Employed worked an average of 240.6 days a year x¯ = 240.6 days…

Q: A sample of 12 pregnant women had the following pulse rate, in beats per minute, measured when they…

A:

Q: From the scores in subject EQT203 for 8 students, it was found that the mean score is 73 and the…

A: We have given that, Sample mean (x̄) = 73, sample size (n)= 8 and standard deviation (s) = 5.15…

Q: As part of the National Health and Nutrition Examination Survey, the Department of Health and Human…

A: 1. Let μ1 is defined as the population mean for self-reported heights, and μ2 is defined as the…

Q: The number of television sets produced from an assembly line each day is known to have a standard…

A: Confidence interval give a range of values for the unknown parameter of the population. The width of…

Q: In a test of physical fitness, a fitness trainer for a group of men ages 65 and older from a local…

A: The population mean is known to be 20. Based on the sample evidence you have to test whether the…

Q: In a simple random sample of 30 shoppers at Greedgate Mall, the sample mean amount spent last week…

A: The provided information are: Sample size (n) = 30Sample meanx¯=259.48Sample standard…

Q: What sample size is necessary such that a 95% confidence interval for the mean, using σ = 3, has a…

A: We have to find the necessary sample size such that a 95% confidence interval for the mean, using σ…

Q: The student government association at a university wants to estimate the percentage of the student…

A: Given: Margin of error = 4% = 0.04 Z for 95% confidence level = 1.96

Q: A race director for a local 10 kilometer “fun run” is trying to estimate the mean time it will take…

A: Confidence interval approach:   If the confidence interval contains the population parameter value,…

Q: The Human Relations Department of Electronics Inc. would like to include a dental plan as part of…

A:

Q: A sample of Alzheimer's patients are tested to assess the amount of time in stage IV sleep. It has…

A:

Q: Using independent random samples, a researcher is comparing the number of hours of television viewed…

A: Given For the seniors of sample size 32, the mean is 3.9 hours with standard deviation of 1.2 hours.…

Q: The lead levels in a random sample of 23 crows in the region were measured and recorded. The mean…

A:

Q: Suppose that the owner of a recently opened convenience store in Kuala Lumpur, Malaysia, wants to…

A: Given: n=16x¯=75s=6

Q: What is the typical age of a person who renews his or her driver’s license online? From a random…

A: Solution: Let X be the age of online renewal users. From the given information, x-bar=42.6, S=5.4…

Q: A chemist made eight independent measurements of the melting point of tungsten. She obtained a…

A:

Q: A bank wonders whether omitting the annual credit card fee for customers who charge at least $2400…

A: Confidence interval give a range of values for the unknown parameter of the population. The width of…

Q: Suppose a study was conducted of community colleges in California to determine the average cost of…

A: As the population standard deviation is not known, we will use t distribution. The t distribution is…

Q: Suppose that Apple Inc wished to estimate the mean talk time for its iPhone before the battery must…

A: Given,   Sample size = 30 Sample mean = 350 Population standard deviation = 90   Since the…

Q: Based on information about the Miami Heat Basketball team, throughout the years 2010 and 2011, the…

A:

Q: 3) A local municipality tests 25 samples of water and finds that the mean concentration of chlorine…

A: Given: Sample size, n = 25            Sample mean, M = 150            Sample SD, s = 18 Since the…

Q: A real estate company is trying to estimate the cost of rent in Houston. They randomly sample 10…

A:

Q: 2. There was a sample of 14 adult wild mountain lions who were caught and released in the San Andres…

A: Given, Number of lions = n = 14 s=sample sd=13.45 x¯ = sample mean = 82.55 α = level of significance…

Q: A market research company wants to estimate the proportion of households in the country with digital…

A: Given that n=80 and x=46.

Q: A civil engineer tested concrete samples to investigate the difference in strength, in newtons per…

A: It is given that 95% confidence interval for the difference in the mean strength between the samples…

Q: In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests."…

A:

Q: A sporting equipment company manufactures 15 pond dumbbells .To ensure that the production line is…

A:

Q: A 92% confidence interval for the mean number of cucumbers a plant produces per season was…

A:

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.