We test whether "cramming" for an exam is harmful to grades. Group one crams for a pretend exam, but group two does not. Each have a sample size (n1) of 31. Group one has a sample mean of 43 and a standard deviation of 8, and group two has a sample mean of 48 and a standard deviation of 9.14. Calculate the effect size. What is it and what does that indicate about the effect?

Q: A random sample of 26 local sociology graduates scored an average of 458 on the GRE advanced…

A: The mean difference between the mean of sample and that of population using the t-test. For the…

Q: Which of the following would be expected to result in a larger standard error of the mean? a larger…

A:

Q: The year Ryan graduated college, he got a job as an entry-level software engineer working for a firm…

A: Given,mean(μ)=$70,000Standard deviation(σ)=$5300Ryan's starting salary(X)=$72,000

Q: Given a sample data set with a Variance of 6.25, what is the Standard Deviation of the data set.?

A: Given, Variance=6.25 sd=?

Q: Given that the mean of a data set is 20, and the standard deviation of this data set is 8, then what…

A: According to the answering guidelines, we can answer only one question at a time and the rest can be…

Q: In a recent study reported Sept. 21, 1952 on the Flurry Blog, the mean age of tablet users is 34…

A: Mean = 34 Standard deviation = 15 Sample size, n = 100 Standard error = σn=15100=1.5

Q: Use the scenario below to answer the following 4 questions. Ron McKeman, a University of Arkansas…

A: Given Information: Sample size n=45 Sample mean x¯=16.55 Sample standard deviation s=3 Significance…

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: We are given that the mean shopping time spent by customers at the supermarkets is The sample mean…

Q: A manufacturer claims that a new snowmaking machine can save money for ski resort owners.  He states…

A:

Q: A random sample of 26 local sociology graduates scored an average of 458 on the GRE advancef…

A:

Q: If you wanted your study to have a smaller standard error, which of these would be a good idea?…

A:

Q: Dougal is filling out college applications that require either a SAT math score or ACT math score.…

A: Given Information: Dougal has an SAT math score of 610 and an ACT math score of 27. Mean SAT math…

Q: If family income is positively skewed in a study with a standard deviation of $18000, knowing the…

A: Given information: The distribution of family income is positively skewed. The median family income…

Q: A professor at a local university noted that the exam grades of her students were normally…

A: Here we need to find x such that P(X>x)=0.0793, where X~N(73,11).

Q: Suppose that a large Introduction to Psychology class has taken a midterm exam, and the scores are…

A: (1) Obtain the proportion of the class got scores above 90. The proportion of the class got scores…

Q: A researcher predicts that smoking cigarettes decreases a person’s sense of smell. On a test of…

A: Given observation 16 14 19 17 16 18 Sum =100

Q: A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of…

A: GivenMean(μ)=48200standard deviation(σ)=5000

Q: Airline companies are interested in the consistency of the number of babies on each flight, so that…

A: Test for Variance: The χ2 Chi-Square test is used to test the significance difference between…

Q: The senior Class of 2012 at Rancho High strongly believesthat they have better grades than their…

A: The paired t-test is used when: the sample sizes are equal. two samples are independent but the…

Q: 1. The average grade of 2nd year students majoring in Civil Engineering is normally distributed with…

A: NOTE- AS PER POLICY I HAVE CALCULATED FIRST MAIN QUESTION ONLY      Here Given For  Civil…

Q: In a chemistry general exam, the grades are approximately Normally distributed with mean 77 and…

A: We have to find out given probabiity.

Q: A company that develops an automated customer service model is interested in knowing whether two…

A: The hypothesis test for the difference between two population means is,

Q: a used car lot lowers the price of every car in the lot by $300. what effect, if any will this have…

A: Mean, median and mode will decrease by $300.

Q: Kellogg's, and Betty Crocker regularly use coupons to build brand allegiance and stimulate sales.…

A:

Q: With a sample of 62, a population mean of 29, and a standard deviation of 9, what is the standard…

A: Givensample size(n)=62population mean(μ)=29standard deviation(σ)=9

Q: The number of incoming students at two campuses of a midwestern university have historically been…

A: Given that the main campus incoming class has a mean of 3,916 and a standard deviation of 375.…

Q: The diameter of a mason jar is 3 inches but can be as large as 3.05 inches and as small as 2.95…

A: In question, We have given upper control limit and lower control limit for mason jar and grand mean…

Q: Two independent laboratories have produced drugs that provide relief to arthritis and the results is…

A: 4. Let μ1 denotes the mean of laboratory A and μ2 denotes the mean of laboratory B. Given:…

Q: A manufacturing company packages shipments in either large or small boxes. A random sample of 40…

A:

Q: cording to a recent pol, 26% of adults in a certain area have high levels of cholesterol. They…

A:

Q: A custodian wishes to compare two competing floor waxes to decide which one is best. He believes…

A:

Q: A&W offers a meal deal if you get burgers and fries. Within North America 65% of A&W customers opt…

A:

Q: Q3 :- :- if you know the standard deviation = 3 for measured data, what is the variance ?

A: Given in question  Standard deviation = 3

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: Given, Population standard deviation (σ) = 40 mg Margin of error (E) = 10 mg Confidence level = 95%

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: The provided information is:

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: The formula for sample size is as follows:

Q: We are trying to test whether a new low fat diet actually helps obese people lose weight. 150…

A: a) let us consider , x=people on low-fat diet( group 1) y=people with same amount of food ( group 2)…

Q: According to a study, the salaries of registered nurse are normally distributed with a mean of 56310…

A: Given,mean(μ)=56310standard deviation(σ)=5038

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A:

Q: Tubes are manufactured in a company that has a mean of life, (hr = 800) and a standard deviation of…

A:

Q: What are the null hypothesis (H,) and the alternative hypothesis (H,) that should be used for the…

A: The type I error is defined is as rejecting the null hypothesis when actually it is true.  The type…

Q: A demographics researcher claims that the mean household income in a recent year is the same in Ada…

A: Given: α = 0.10 n1 = 18 X1 = 58300 s1 = 9000 n2 = 20 X2 = 56600 s2 = 15600 Formula Used: t-test…

Q: Airline companies are interested in the consistency of the number of babies on each flight, so that…

A: Given n=23 sample standard deviation, s = 9 population standard deviation, σ = 6 and  α = 0.05

Q: The college board reports that in a recent year, the mean mathematics SAT score was 514, and the…

A:

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: wo independent laboratories have produced drugs that provide relief to arthritis and the results is…

A: Given: To explain the given statement as follows,

Q: The following percentages of chloride were found: 32.52%, 32.14%, 32.61%, and 32.75%. Find the mean,…

A: The following percentages of chloride were found: 32.52%, 32.14%, 32.61%, and 32.75%  We can rewrite…

Q: he management of a national automobile manufacturer advertises a free transmission if it fails. The…

A:

Q: The consumer board’s alternative hypothesis is:

A: Here use basic of how to define null and alternate hypothesis

Q: . According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: (1) We have given that,  Sample mean (x̄) = 203, standard deviation   (s)= 6.2 , sample size (n) = 9…