Joe is doing a project for his sociology class in which he tests the claim that a certain housing project contains family units of average size 3.3 people (the national average). A random sample of 64 families in this housing project gives an average of 4.3 people per family per unit with a standard deviation of 1.3. Is this evidence that the average size of a family in this project is different from the national average? Test at 5%.

Q: A company conducted a study of the listening habits of men and women. One facet of the study…

A: Solution: State the hypotheses. Null hypothesis: That is, there is no difference in the variation…

Q: One year Thomas had the lowest ERA​ (earned-run average, mean number of runs yielded per nine…

A: We have given that  X~N( μ , ?^2 )   Z-score =( x - μ )/?

Q: For a study conducted by the research department of a pharmaceutical company, 260 randomly selected…

A: We have given that Sample mean (x̅1) = 17.80Sample mean (x̅2) = 18.20Sample size (n1) = 260Sample…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Let be the group runners training for marathons be population 1 and       be the individual runners…

Q: An interesting research question is an effect, if any, that different types of teaching formats have…

A: Data for hybrid students-sample 1The sample size The sample mean The sample standard deviation Data…

Q: A researcher wants to test if there is a significant difference in the mean salary between men and…

A: We have given that For Men: Sample size (n1) = 50 Sample mean (x̅1) = 62 Standard deviations (σ1) =…

Q: Does the data provide sufficient evidence to conclude that the true mean number of sales at location…

A: Given, For location A; n1=18 x1¯=39 s1= 8 For location B; n2=13 x2¯= 49 s2= 4 Significance level, α…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Sample mean (x̅1) = 42.8Sample mean (x̅2) = 40.9Sample size (n1) = 34Sample size (n2) = 41Standard…

Q: Ten years ago, the mean age of death row inmates was 44.9 according to the US Dept.of Justice. A…

A: The provided data is,

Q: Finn, a tourism expert, is researching the price of burgers on Highway 1. He randomly selected 18…

A: Given, Finn, a tourism expert, is researching the price of burgers on Highway 1. He randomly…

Q: The term "Freshman 15" refers to the claim that college students typically gain 15 lb during their…

A: Let X be the random variable denoting that the amounts of weight that male college students gain…

Q: A study regarding the gender socialization of children growing up in nontraditional families…

A: The sample size is 57, sample mean difference is -2.0857 and standard deviation is 3.5868.

Q: university in England and each student in a random sample of 38 female students from the same…

A: The following information has been provided: For Males : Sample Mean 1 (Xˉ1)(\bar X_1)= 282282…

Q: wish to evaluate the differences in educational quality between two training centres (A and B). You…

A: Provided information is,  Random sample of 95 individuals trained at centre A, and an independent…

Q: company has surveyed 40 customers who shop on a particular online commerce platform and the company…

A: Given that  Mean = 23 , Standard deviation = 14

Q: Burn’s Depression Checklist to them, a test commonly used by mental health professionals to as-sess…

A: xbar = 48 mu = 32 s = 6 n =20

Q: Dr. Vegapunk thinks that watching anime (Japanese animated shows) decreases social skills in college…

A: Dr. Vegapunk thinks that watching anime (Japanese animated shows) decreases social skills in college…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Consider X be a random variable which follows normal distribution indicating the score earned on a…

Q: Researchers want to compare the relative effectiveness of two popular diets. They randomly assign…

A:

Q: unts of weight that male college students gain during their freshman year are normally distributed…

A: Given that.   X~N( μ , ?^2 )   μ=2.3     , ?=10.2   Z-score =( x - μ )/?

Q: According to a recent study published by the American Statistics for Educators Journal, statistics…

A: We habe to find p value.

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

A: Solution: Hypothesis testing:   From the above hypothesis test we can conclude that the low fat…

Q: A paper describes asrvey ofasample of e maie students and a sampie of 5 female students ata large…

A:

Q: A group of researchers wants to see if being diagnosed with ADHD is associated with a higher level…

A: Given information, x¯=48s=6n=20μ=32 A) Test statistic: t=x¯-μsn =48-32620 =11.9257 Critical values:…

Q: For a study conducted by the research department of a pharmaceutical company, 205 randomly selected…

A: Given Sample size n1=205, sample mean x̄1=17.6, s1=sample standard deviations=5.3,  n2=sample size…

Q: nsurance Company A claims that its customers pay less for car insurance, on average, than customers…

A: The question is about hypo. testing Given :  Randomly selected people who buy insurance from comp. A…

Q: Two samples of 103 and 80 students are taken with a view to find out their average monthly…

A:

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Given data,n1=40x1=46.6σ1=4.6n2=45x2=48.8σ2=2.4Compute value of test statistic?

Q: Researchers want to compare the relative effectiveness of two popular diets. They randomly assign…

A: we have given that   There are 200 volunteers in each group.   the Group A had lost on average 7.8…

Q: Insurance Company A claims that its customers pay less for car insurance, on average, than customers…

A: From the provided information,

Q: An instructor has two different copies of a test, and randomly distributes them to their students.…

A: Introduction: Denote μ1, μ2 as the true population mean scores for test versions B and C…

Q: A study regarding the gender socialization of children growing up in nontraditional families…

A: Hypothesis test is consists of two statements. They are null and alternate hypothesis. Null…

Q: A random sample of 100 chemistry students were asked how many lab classes he or she was enrolled in…

A: n1=n2=100,x1¯=1.65,x2¯=1.82,s1=1.39,s2=1.51,α=0.02Decision rule: When p value< level of…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Let be the group runners training for marathons be population 1 and       be the  individual…

Q: The term "Freshman 15" refers to the claim that college students typically gain 15 lb during their…

A: To determine the probability that a randomly selected male college student gains 15 pounds or more…

Q: According to a recent study published by the American Statistics for Educators Journal, statistics…

A:

Q: An article appeared in an Australian newspaper. It described a study of academic performance and…

A:

Q: When 40 people used Weight Watchers for one year, their mean weight loss was 3.0 lbs and their…

A: The test hypotheses are given below: H0:μ=0 lbsHa:μ>0 lbs From the given information, the…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 253 and a standard…

A: From the provided information, Mean (µ) = 253 Standard deviation (σ) = 80

Q: You wish to evaluate the differences in educational quality between two training centres (A and B).…

A:

Q: After post-graduate study, Mike found a job as HR analyst in London. The company is currently…

A:

Q: Suppose that you randomly survey death records for people born in 1900 in Louisiana and compared the…

A:

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: The objective of this question is to test the claim that there is a significant difference between…

Q: before and after taking the drug. The sample mean blood pressure before taking the drug was 120 mmHg…

A: