A test to measure the gullibility of college students is designed to have a mean of 70 and a standard deviation of σ=11. Determine the minimum sample size needed to estimate the population mean gullibility quotient of statistics students with 95% confidence and margin of error, E=1.50.

Q: The mean tar content of a simple random sample of 25 unfiltered king-size cigarettes is 21.6 mg,…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: A survey of nonprofit organizations showed that online fundraising has increased in the past year.…

A: Given that Sample size n = 50 Sample mean,M = 29 Sample SD, s = 7 The critical value of t at 90%…

Q: Can repressed anger lead to higher blood pressure? In a hypothetical study, 16 college students with…

A: Let, X be mean blood pressure. Given, n= sample size = 16 μ = population mean= 120 σ = population sd…

Q: A recent survey reported that small businesses spend 24 hours a week marketing their business. A…

A:

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

A:

Q: a sample of 64 measurements are randomly selected from a poulation with a mean of 30 and a standard…

A: We have given that Sample size (n) = 64 Mean(µ) = 30Standard deviations (σ) = 5

Q: the filling variance for boxes of cereal is designed to be .02 or less. a sample of 41 boxesof…

A:

Q: A random sample of 17 police officers in Brownsville has a mean annual income of $35,800 and a…

A: Denote μ1, μ2 as the true population mean incomes of police officers for Place B and G,…

Q: The average standard deviation of the waiting time for a single queue is 4.7 minutes. The average…

A: The hypotheses for the test are given below: Null hypothesis: H0: σ=4.67. Alternative hypothesis:…

Q: A particular manufacturing design requires a shaft with a diameter of 21.000 ​mm, but shafts with…

A: Note: Hi there! Thank you for posting the question. As there are multiple sub parts, according to…

Q: In a random sample of 8 cell​ phones, the mean full retail price was ​$521.70 and the standard…

A: A random sample of 8 cell​ phones, the mean full retail price was ​$521.70 and the standard…

Q: A recent survey reported that small businesses spend 24 hours a week marketing their business. A…

A: Given information: Sample size(n)=80. Sample mean(X¯)=23.0 Population standard deviation(σ)=5.4.…

Q: A particular manufacturing design requires a shaft with a diameter of 21 000 mm, but shafts with…

A: The mean is 21.002 mm and the standard deviation is 0.006 mm.

Q: For a population mean of 50, a sample mean of 52, an estimated standard deviation of 3, and a sample…

A: Given information Population mean µ = 50 Sample size (n) = 20 Mean x̅ = 52 Standard deviation (s) =…

Q: A researcher claims that the mean sodium content of sandwiches at Restaurant A is less than the mean…

A: n1 = 22n2 = 28   x1 =670x2 = 690 s1 = 20s2 = 30

Q: A particular manufacturing design requires a shaft with a diameter of 24.000 mm, but shafts with…

A:

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: Use a 10% significance level to test the claim that the standard deviation of birth weights of girls…

A:

Q: In order to estimate the average electric usage per month, a sample of 81 houses was selected and…

A: Given datasample size , n =81Population S.D , σ =310For 90% CIP(-z<μ<z) = 0.90∴ z=1.645…

Q: A sports equipment company develops a type of synthetic fishing line which is claimed to have an…

A: One sample z-test is used to test the difference between sample mean and population mean when the…

Q: If the population standard deviation is 10, how large a sample is necessary to have a standard error…

A: The population standard deviation is 10 and the standard error is less than 5 points.

Q: A sample of 20 cans of tomato juice showed a standard deviation of 0.4 ounces. A 95% confidence…

A: we have given that, sample size = 20 standard deviation = 0.4 now, variance= (standard deviation)^2…

Q: In a particular community, it is claimed that the mean household water usage for a particular month…

A:

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: The average length of a trout caught from a certain lake is 10.4 inches, with a standard deviation…

A: Given that the population mean= 10.4 inches and standard deviation of 1.5 inches

Q: The distribution of average wait times in drive-through restaurant lines in one town was…

A:

Q: snip

A: Given: σ=0.2n=5 The standard deviation in the sampling distribution is obtained as below:…

Q: Find quartile deviation and its co-efficient from the following data.

A: The quartile deviation is defined as Q.D = (Q3 - Q1)/2 Where Q3 = third quartile and Q1 = first…

Q: When conducting a t-test, you obtain the estimated standard error by dividing the sample standard…

A: Given the standard error is obtained by dividing the sample standard deviation by A. n-1B. nC. n-1D.…

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

A:

Q: In a study of auto collision insurance costs, a ma of 80 auto body repair costs per damage has a…

A: Given Data: Margin of error=10 n=80 x¯=472.36s=62.35

Q: To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19…

A:

Q: The 2008 General Social Survey asked a large number of people how much time they spent watching TV…

A: According to the given question, The 2008 General Social Survey asked a large number of people how…

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: Solution : Given : σ = 8             n  = 200             x¯  = 170 Confidence level = 0.85      ∴…

Q: The average salary for a certain profession is ​$80,000. Assume that the standard deviation of such…

A: We have to find correct answer..

Q: A researcher conducted a research at a local high school wherein she found out that, among the 150…

A:

Q: For a population with a mean of μ = 75 and a standard deviation of σ = 7, find the z-score…

A: Population mean μ=75, standard deviations σ=7, M=84, n=6

Q: A sample of size 400 is taken from a population whose standard deviation is 16. Find the standard…

A:

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: Given that,  n=200 X bar=170 Std. dev.=σ=8

Q: In a particular city, the average annual salary for secretaries is $28,000.   A sample of 50…

A:

Q: The mean tar content of a simple random sample of 25 unfiltered king-size cigarettes is 21.4 mg,…

A: The following information has been provided: Sample Mean 1 (Xˉ1)(\bar X_1) = Unfiltered King…

Q: A manufacturer claims that the light bulbs that they produce have a mean lifetime of 1,200 hours and…

A: It is given that, A manufacturer claims that the light bulbs that they produce have a mean lifetime…

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 random sample of 100 observations from a quantitative population produced a sample mean of 28.0…

A: From the provided information, Sample size (n) = 100 Sample mean (x̄) = 28.0 Standard deviation (s)…

Q: A non-symmetric dataset has a mean of 200 and a standard deviation of 15.  Find an upper bound for…

A: Given: μ = 200 σ = 15 Solution: First calculate one sigma limit  μ ± σ = 200 ±15=185, 215 Two sigma…

Q: In a particular community, it is claimed that the mean household water usage for a particular month…

A: Hypothesis testing is conducted for the parameters of the population like population mean,…

Q: A radio station claims that the amount of advertising per hour of broadcast time has an average of…

A: It is given that, A radio claims that the amount of advertising per hour of broadcast time has an…

Q: A marine biologist claims that a harbor seal's average dive time is at least 5.8 minutes. A random…

A:

Q: According to an article in Good Housekeeping, a 128-lb woman who walks for 30 minutes four times a…

A: Given, Sample size = 35 Sample mean = 9.1 Sample standard deviation = 5   Set up the null and the…