A researcher is looking at data from a large population with a standard deviation that is much too large. In order to concentrate the information, the researcher decides to repeatedly sample the data and use the distribution of the means of the samples? The first effort used sample sized of 100. But the standard deviation was about double the value the researcher wanted. What is the smallest size samples the researcher can use to remedy the problem?

Q: For a population with +0.25. [Round to the nearest hundredths place if a decimal. If your calculated…

A: Given,Mean(μ)=30standard deviation(σ)=8and Z-score=0.25

Q: 6.7 A grocery supermarket chain is considering an outlet near a new middle-income $42,000 per ment.…

A: Here, mean is 43500 standard deviation is 900 and sample is 36. Population mean is 42000. We will…

Q: Description A Relaxin receptor agonist drug (RRA01) for the acute heart failure treatment is…

A: Given that: Significance level, α=0.05 Null hypothesis states that there is no difference in the…

Q: An educational psychologist is examining response times to an on-screen stimulus.  The researcher…

A: The data shows the response times in milliseconds.

Q: 6.24 An industry pays an average wage rate of $9.00 per hour. A sample of 36 workers from one…

A: The sample size is 36, sample standard deviation is $0.60, and the population standard deviation is…

Q: 3. A certain type of integrated circuit is connected to its frame by five wires. Thirty samples of…

A: Given Information: Consider the given means: X¯¯=9.81 , R¯=1.14, s¯=0.4647

Q: Which of the following Pearson correlations shows the greatest strength or consistency of…

A: Here we have to identify  Which of the following Pearson correlations shows the greatest strength or…

Q: A simple random sample of size n is drawn. The sample mean, x, is found to be 19.4, and the sample…

A: GivenMean(x)=19.4standard deviation(s)=4.7

Q: Year Expenditure (billions $) 1359 1878 2016 2320 2498 2689 3298 3533 4032 2000 2004 2005 2007 2008…

A: Given Information: Consider the given dataset in which the number of years is an independent…

Q: A major company would like to assess the impact of using a professional trainer to conduct a…

A: The given mean for control group is 17.5, and workshop is 22.7, the sample sizes are 8 for each.

Q: Based on a survey, assume that 28% of consumers are comfortable having drones deliver their…

A: It is given that 28% of the customers are comfortable having drones deliver their purchases.  Thus,…

Q: The data show the chest size and weight of several bears. Find the regression equation, letting…

A: The independent variable is Chest size. The dependent variable is Weight. We have to predict the…

Q: The Consumer Expenditures report released by the U.S. Bureau of Labor Statistics found the average…

A: The given Consumer Expenditures report released by the U.S. Bureau of Labor Statistics found the…

Q: Only 16% of registered voters voted in the last election. Will voter participation decline for the…

A: The hypothesized proportion is 0.16.

Q: modified as follows: In a random sample of 55 panels, the average failure time is 2.07 years and the…

A: Given: n = 55 X = 2.07 s = 1.11 Confidence level = 91.7% Formula Used: Confidence interval = X ± tsn

Q: suppose X is the time it takes employee to type and send a letter of recommendation. Suppose X has a…

A: The information provided in the question are as follows : Mean (µ) = 10.5 Standard deviation (σ) = 3…

Q: Estimate the minimum sample size needed to achieve the margin of error E=0.013 for a​ 95%…

A: given data  E = 0.013 ci for P 95% ci n = ?

Q: 9.57 Refer to Exercise 9.18. Is the estimator of o² given there an MVUE of o²?

A: As per the Bartleby guildlines we have to solve first question as asked by student.... Given that

Q: Which of the following are the correct statements of the null and alternative hypotheses, Ho and HA,…

A: It is given that the data of chocolate consumption and happiness.

Q: 9.63 Let Y₁, 2, Y,, be a random sample from a population with density function 3y² 83 0 ≤ y ≤0, 0,…

A:

Q: Here are summary statistics for randomly selected weights of newborn girls: n=227, x= 31.7 hg, s=…

A: Given that  Sample size n =227 Sample mean=31.7 Standard deviation =7.9

Q: boxes of cereal are labeled as containing 14 ounces. Following are the weights, in ounces, of a…

A:

Q: It is known that students scores on the final exam follow a normal distribution th standard…

A: Given information: Population standard deviation is 6.6. Random sample of 25 students. That is,…

Q: A. O B. tx/2 (Round to two decimal places as needed.) 2a/2 = (Round to two decimal places as…

A: It is given that  Sample size, n = 58 Confidence level = 90%

Q: Find the 25th, 50th, and 75th percentile from the following list of 28 data 2 5 6 9 12 14 15 19 22…

A: here sample size (n) = 28

Q: Analyzing data, you found that the probability that a computer user clicks on the online ad of your…

A: The question is about identifying the distribution Given : Prob. of computer user clicks on the…

Q: Independent events A and B would be consistent with which of the following statements: i. P(A)=.5,…

A: Solution-: Independent events A and B would be consistent with which of the following statements:…

Q: 10. A Gaussian RV X is N(0, o2-4). Find the conditional pdf: fxx>2(x); i.e., find the conditional…

A: X is a normal distribution with mean 0 and variance 4 X ~ N(0,σ2 =4) So,  Z = X-04=X2 ~ N(0,1) CDF…

Q: A major company would like to assess the impact of using a professional trainer to conduct a…

A: The question is about formulation of null and alt. hypo. Introduction : Tail of test : 1 ) If alt.…

Q: g) What are your conclusions in the context of the problem? Relate your conclusions to the test…

A:

Q: A researcher is interested in the relationship between age and golf performance. The researcher…

A: The question is about correlation Given :   To find : Appropriate value of z, t or r

Q: If the pdf of a random variable X is f(x) = {0,0 0.15-0.15(x-0.5), x ≥ 0.5 otherwise Find the moment…

A:

Q: A firm purchases a very large quantity of off-cutts metals and wishes to know the average weight of…

A:

Q: A club has 20 male and 80 female members. If a committee of 20 is being formed by random selection,…

A: In systematic sampling, every kth unit is selected after the first unit.

Q: A researcher was investigating variables that might be associated with the academic performance of…

A: The given coefficient of the variable $Per Pupil is 0.00639 and standard error is 0.0025.

Q: (Round to four decimal places as needed.) The second quartile is Q₂ = (Round to four decimal places…

A: Sorted data: {-0.14, -0.11, -0.10, -0.08, -0.05, -0.05, -0.04, -0.04, -0.02, -0.02, -0.02, -0.02,…

Q: (10) = {01²-¹0 0, elsewhere. a Show that this density function is in the (one-parameter) exponential…

A: Note:: According to Bartleby guidelines expert solve only one question and maximum three subpart of…

Q: In a survey of 1118 U.S. adults conducted in 2012 by the Financial Industry Regulatory Authority,…

A: given data  n = 1118 x = 810 98% ci for p = ?

Q: How will I draw this bar chart using R code? X axis will be month, y axis will be the amount of…

A: R syntax:

Q: 2. The manufacturer of a certain type of automobile claims that under typical urban driving…

A: Given that b...we have write the assumptions of Statistical test

Q: month tail Milk P milk for s er gallon listed in the ed in kn price for Conference on Social…

A: We want to construct a 95% confidence interval for the population mean

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A: Given that the commuting time to and from work is approximately normally distributed, with a mean of…

Q: 10- Refer to the accompanying scatterplot. a. Examine the pattern of all 10 points and subjectively…

A: We can create the data table for the given scatter plot and calculate correlation coefficient.  X…

Q: line​ read, "More Than Half of Americans Say Federal Taxes Too​ High." The headline was based on a…

A: given data,claim :p>0.5x=609n=1202p^=xn  =6091202  =0.5067α=0.01

Q: a 95% confidence interval to estimate the size effect of the population mean difference

A: d¯ = 7sd = 6n = 9 Confidence Interval to estimate the difference in Related population…

Q: A researcher believes that if students experience a particular form of positive coaching, then they…

A: It is given that when students experience a particular form of positive coaching, then they will be…

Q: K The data to the right represent the number of customers waiting for a table at 6:00 P.M. for 40…

A: Please note that as per our guidelines if multiple sub parts are there in a question we can answer…

Q: bability of randomly selecting a household that has one or two televisions. is er or a decimal. Do…

A: Given The probability distribution of number of televisions per household in a small town

Q: Select 8 white cars, 5 blue and 3 red cars. v. Name one advantage of the sampling method in ii)

A: We have to tell sampling technique for mentioned example :

Q: Q2) In the following table (A), FBI 2012 data for violent crimes is reported by sex of offenders and…

A: Note: Table B is required to attempt (e-f). In the following table (A), FBI 2012 data for violent…