A research done by a graduating student reports that the average score of University students in statistics course is less than 80. To test this claim, a random sample of 10 students was taken and their scores in the course are recorded as: 65,70, 80, 85, 60, 90, 80, 75, 85, 90.

Q: A study of 100 Stat 101 students revealed that the 55th percentile of their final exam scores is 45.…

A:

Q: Nationally, 60% of American own American cars, 29% of Americans own Asian cars, and the remaing…

A: Given that- P(American car | American) = 0.6 P(Asian car| American) = 0.29 P( non-Asian foreign car…

Q: A 2016 Pew Research poll found that 18% of cell phone owners use their phone for conducting…

A: It is given that the total number of cell phone uses are 18%, thus the population proportion is…

Q: A medical researcher says that at least 23% of Canadian adults are smokers.In a random sample of 200…

A: The null hypothesis is a simple statement about the value of the population parameter which is…

Q: In one city, there are a total of 1,640 5-year-old children of whom 553 live with one parent only.…

A: Given, Size of the population of 5-year-old children N=1640 Children with one parent only in the…

Q: Market research has shown that 60% of persons who are introduced to a certain product actually buy…

A: According to the provided information, p=0.60

Q: A group of randomly selected members of Mothers' Club were asked how many kids they have. The table…

A: The most reasonable estimate for the number of mothers’ club members who have fewer than 2 kids is…

Q: The General Social Survey asked a sample of 1294 people whether they performed any volunteer work…

A: The null and alternative hypothesis, This is the right-tailed test, for α=0.05 The critical value…

Q: A recent report stated that only 20% of all college graduates find work in the field of their…

A: Given data: Sample size = 400 x = 100 Consider significance level  = 0.05 To test the claim: Does…

Q: The following table of random numbers of 2 digits each is provided to field investigator. 34, 96,…

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Q: According to a study on reptiles from decades ago, the mean lifespan of giant Aldabra tortoises in…

A: The sample size is 17, sample mean is 88.3, and sample standard deviation is 1.8. The population…

Q: An education researcher claims that at most 3% of working college students are employed as teachers…

A: Solution: From the given information, p-hat=0.04 and n=200. The given claim is that at most 3% of…

Q: A recent random sample of 7 college graduates who found a job reported their GPA and entry level…

A:

Q: A researcher is studying changes in the student body at her university and has selected a random…

A: (a) (b) (c)

Q: At a local university, English instructors are supposed to grade essays in a class so that the…

A: Given,   Sample size = 22 Sample mean = 79.1 Sample standard deviation = 6.5

Q: In a survey of 70 business firms, it was found that 45 were planning to expand their capacities next…

A: Given data number of success , x= 45 sample size, n =70 population proportion,p=…

Q: A recent study reported that in a random sample of 248 women, 58 had changed their political…

A:

Q: Assume that half the population is vegetarian so that the chance of an individual being a vegetarian…

A:

Q: A labor statistician claims that 6% of the labor forces will be laid off likely  to pandemic impact.…

A: Solution: Let X be the number of employees will be likely to be laid off and n be the sample number…

Q: A research done by a graduating student reports that the average score of University students in…

A: Given that:Data points [65.0, 70.0, 80.0, 85.0, 60.0, 90.0, 80.0, 75.0, 85.0, 90.0] From Data…

Q: Suppose that a poll taken 10 years ago found that 56% of parents spank their children. Suppose a…

A: In a poll 10 years ago it is found that 56% of parents spank their children.

Q: A real estate agent working in a large city believes that, for three-bedroom houses, the selling…

A: From the given information,       β1( slope)=-2.158,S.E( β1) =0.149n=20α=0.05

Q: A recent survey found out that 52% of girls 14-17 years old wear contacts. We take a random sample…

A:

Q: In the sample of 1000 people in Maharashtra,540 are rice eaters and the rest are wheat eaters. Can…

A: Given: Sample size (n) = 1000 Number of success or rice eaters (x) = 540 Level of significance =…

Q: A sample of 800 truck drivers from Minnesota were interviewed randomly and 316 answered they like…

A:

Q: The percentage of residents ofa certain country who support stricter gun control laws has been 52%…

A: From the provided information, Sample size (n) = 1067 From 599 are in favor of stricter gun control…

Q: The manufacturer of a new drug claims that it will lower blood pressure by 13 points on the average.…

A: Given that: Data points [12.0, 8.0, 15.0, 9.0, 10.0, 16.0] From Data points we get following: x̄=…

Q: It is believed that in the upcoming election, 65% of the voters in Baguio City will vote or…

A:

Q: The U.S. Bureau of Labor and Statistics reported that a person between the ages of 18 and 34 has had…

A:

Q: According to a home securities company, the highest percentage of home burglaries occur during the…

A: The critique of the study is invalid Since, the data is collected for 10 years of period and…

Q: Suppose a professional basketball player historically makes 39% of his three-point field goals.…

A: In this case, a test is required to see whether three-point goal shooting has improved. Here, the…

Q: A​ gender-selection technique is designed to increase the likelihood that a baby will be a girl. In…

A: We have to perform hypothesis test for proportion.

Q: In a recent election, 54% of all registered voters participated in voting. In a survey of 350…

A: Writing the sample population as a percentage i.e. 217 of 350:

Q: An online poll of 810 students found the 53% of the respondents and critical thinking should be…

A: Given,   Sample size = 810 Sample proportion = 0.53   The null and alternative hypothesis is:

Q: A real estate agent working in a large city believes that, for three-bedroom houses, the selling…

A: Given: n = 20 Slope = -2.158 Standard error for the slope  of regression line = 0.149 Significance…

Q: a newspaper article claims that the average age for people who recieve food stamps is 35 years. You…

A: Given that, A newspaper article claims that the average age for people who receive food stamps is 35…

Q: According to a recent Pew Research Center report, many American adults have made money by selling…

A: Given Data: x=914 n=4579   p^=xn=9144579=0.1996

Q: “In a recent survey, 63% of decided voters said they would vote for the mayor in the next election.…

A: The confidence interval for population proportion is given by; p^-ME,p^+ME where, ME=zα/2p^(1-p^)n

Q: Critical Values=

A: Obtain the critical value in case of right tailed hypothesis testHere, it is given that the…

Q: A dietician read in a survey that 70.5% of adults in the U.S. do not eat breakfast at least 3 days a…

A: It is need to be tested whether the population proportion of adults in U.S who do not eat breakfast…

Q: A survey reported that 68% of registered voters in California approved of allowing two people of the…

A: Define the following events:   A:  a resgister voter who approve gay marriage. B: a ragister voter…

Q: A study at an amusement park found that, of 10,000 families at the park, 1530 had brought one child,…

A: GIVEN DATA : In the amusement park, there are 10,000 family 1530 family have one child,  1810 family…

Q: Suppose the researcher theorizes that 75% of physics students are male. He surveys a random sample…

A: Hypotheses are H0: P=0.75 H1: P≠ 0.75

Q: Twenty different statistic students are randomly selected. For each of them, their body temperature…

A: Correlation: A correlation or correlation coefficient is a numerical value that measures and…

Q: According to Inc.com, 71% of job seekers used social media in their job search in 2018. Many believe…

A: The answer is given in the below image. Please let me know if there something needs to be added.

Q: It is claimed that the percentage of viewers tuned to a TV station's new sitcom is 30%. Out of the…

A:

Q: A market research firm is hired to estimate the percent of adults living in a large city who have…

A: Given data,Number of people surveyed n=500Who has cellphones is x=421Construct a 95% confidence…

Q: A researcher claims that 89% of people sleep with a pillow.  In a random sample of 1000 people, 825…

A: The null and alternative hypothesis is given by; H0: p=0.89Ha: p≠0.89The given level of significance…

Q: A random sample of 16 statistics examinations from a large population was taken. If5 students scored…

A: Here use z test of proportion