A researcher is interested in the decrease in adolescent BMI after a new after school program is implemented to promote exercise in children. Suppose the researcher wants to collect a SRS of children from the program in order to evaluate their loss in BMI. If the population standard 22 deviation is 4.87 kg/m , and the researcher wants to capture the mean BMI within 4 kg/m , how many children should he sample to attain 95% confidence?

Q: A scrap metal dealer claims that the mean of his sales is “no more than $80,” but an Internal…

A: Given that, Mean= 91 Standard deviation, sigma= 21 Sample size, n=20 Hypothesis,  Ho:  the agent’s…

Q: A sample of 16 scores has a standard error of 12. What is the standard deviation of the population…

A: The standard error of the mean is,

Q: Companies who design furniture for elementary school classrooms produce a variety of sizes for kids…

A: Given : -

Q: A study was conducted to assess the effects that occur when children are exposed to cocaine before…

A: Let population 1: children borns to cocaine users. population2: children borns to cocaine no-users.…

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 140 Ib, the boat was…

A: Given Information; Population mean (u) = 140 lb Sample mean (x) = 173.7 lb Sample size (n) = 50…

Q: Walleyes found in lake Windermere have a mean length of 18.4 inches with a standard deviation of 4.2…

A:

Q: An article in American Demographics claims that more than twice as many shoppers are out shopping on…

A: GivenMean(μ)=180standard deviation(σ)=20

Q: In a study examining the effect of alcohol on reaction time, Liguori and Robinson (2001) found that…

A: From the provided information, Sample size (n) = 25 Sample mean (x̅) = 422 Population mean (µ) = 400…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: Given information: The investigator is specially interested to test whether the mean tenure for a…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A:

Q: In a study of employee stock ownership plans, satisfaction by employees is measured and found to be…

A: Given,mean(μ)=4.89standard deviation(σ)=0.63sample size(n)=450

Q: Subjects in a study by Dabonneville et al. (A-9) included a sample of 40 men who claimed to engage…

A: From the provided information, The hypotheses can be constructed as: H0: µ1 = µ2 H1: µ1 < µ2…

Q: A research article claims that the mean cost of raising a child from birth to age 2 in a rural area…

A: Given : population mean is $10460

Q: Realtor Elaine Snyderman took a random sample of 12 homes in a prestigious suburb of Chicago and…

A: Given, Null Hypothesis(H0): μ = 825000 Alternate Hypothesis(Ha) : μ < 825000 α = 0.05 x¯ = 780000…

Q: Calculate the sample estimate of the standard error of the mean. Show all work.    b. Construct a…

A: Given that Sample size n = 36 Sample mean = 6.8 Sample SD = 1.2 The critical value of t at 98%…

Q: a) Compute the mean number of yellow eggs in samples of 58 eggs? (that is the same as asking for the…

A: Here use binomial theorem  Finite number of trial (n=58) Each trial independent from each other…

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A: Given information, the mean is 27.09 and a standard deviation of 12.43 lb. That is, μ=27.09 and…

Q: Ackerman & Goldsmith (2011) found that students who studied text from printed hard copy had better…

A: We start with defining some of the constants in the question: Sample size n = 10. Population mean…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: Given information- Population mean, μ = 9 years Sample size, n = 95 Significance level, α = 0.01…

Q: Find the 90 percent confidence interval for the variance and standard deviation for the time it…

A: Solution :  Given : n = 27             s = 8.9 minutes             α = 0.1 Confidence interval for…

Q: A medical investigation claims that the average number of infections per week at a hospital in…

A: Let us first state the hypotheses and find what we need to prove Let us assume that  H0: μ=16.3.…

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 143 lb, the boat was…

A: We have to find given probability.

Q: The waiting time to check out of a supermarket has had a population mean of 10.28 minutes. Recently,…

A: State the hypotheses That is, there is no evidence that the population mean waiting time to check…

Q: A national business magazine reports that the mean age of retirement for women executives is 63.7. A…

A:

Q: An article in American Demographics claims that more than twice as many shoppers are out shopping on…

A: Let X be the random variable from normal distribution with mean (μ) = $180 and standard deviation…

Q: r feels that the mean hospital stay in 2002 should be less due to initiatives aimed at reducing…

A: We are given: μ=Population mean=7.1x¯=Sample mean=6.85s=Sample standard devitaion=7.01n=Sample…

Q: A community health plan wishes to estimate the mean number of visits per plan participant in a year.…

A: Given that Margin of Error, E = 2 Population SD = 6.3 Level of confidence = 0.95 The critical value…

Q: years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of x =…

A: (a)   The following null and alternative hypotheses need to be tested: Ho: \muμ ≥ 99 Ha: \muμ <…

Q: An automatic coffee machine dispenses cups of coffee whose volume per cup varies normally with the…

A: Answer :

Q: A company was concerned about the length of time a particular vitamin they produce retained its…

A: Formula : Standard error = √Sd2/n

Q: A physician compared the cholesterol levels of a representative sample of Americans who ate an…

A: A physician wants to compare the cholesterol levels of a random sample of Americans who ate American…

Q: A retailer believes that its new advertising strategy will increase sales. Previously, the mean…

A: Given that A retailer believes that its new advertising strategy will increase sales. Previously,…

Q: Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys…

A: Given thatMean (µ) = 13Standard deviation (σ) = 9Sample size (n) = 35Sample mean = 17

Q: A manufacturer is concerned about the variability of the levels of impurity contained in…

A:

Q: 11 and the standard deviation is 1.5. (a)What is the probability of randomly selecting a man with a…

A:

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 133 Ib, the boat was…

A: Solution

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A:

Q: The 2015 general Social Survey asked a large number of people how much time they spent watching TV…

A: Solution: Given information: n= 39 Sample size s = 2.8 Sample standard deviationμ= 4.2 Population…

Q: A credit bureau analysis of undergraduate students' credit records found that the average number of…

A: State the hypotheses. That is, there is no evidence to conclude that the mean number of credit…

Q: Consider the time it takes, in minutes, for police officers to respond to a 911 call, where a…

A:

Q: A credit bureau analysis of undergraduate students' credit records found that the average number of…

A:

Q: Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys…

A: Given: Sample size, n=35 Sample mean, x=17 Population standard deviation = 4 (a) The null and…

Q: here is some evidence that REM sleep, associated with dreaming, may also play a role in learning and…

A: H0:μ = 110 H1: μ > 110

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A: We have given that  Sample size n= 45  Sample mean = 7328 Population standard deviation = 840

Q: A graduate student is performing a study on a new antidepressant. The drug is supposed to reduce…

A: The random variable score follows normal distribution. We have to test whether the average score for…

Q: A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her…

A:

Q: Subjects in a study by Dabonneville et al. (A-9) included a sample of 40 men who claimed to engage…

A:

Q: The hotel industry has been greatly impacted by the COVID-19 pandemic. Suppose that traditionally…

A: Determine the occupancy percentage to be fall in the top 1.19% of the distribution.   The occupancy…

Q: Suppose the weights of seventh-graders at a certain school vary according to a Normal distribution,…

A: From the given information,   Suppose the weights of seventh-graders at a certain school vary…

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.