The owner of a café has recently surveyed a random sample of n = 250 customers of the café. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to make a renovation to older customers. If not, no renovation changes will be made. Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. If she wants to be 99% confident in her decision, what decision should she make?    Reject H0.   Accept H0.   Fail to reject H0.   We cannot tell what her decision should be from the information given.

Q: In a series of 5 observations, the values of mean and variance are 4.4 and 8.24. If three…

A: It is given that the mean and standard deviation are 4.4 and 8.24.

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: Let mean numbers of calls for Karen’s is µ1 and mean numbers of calls for Jodi’s is µ2.We have given

Q: In preparation for the upcoming school year, teacher looks at raw test scores on the of looking at…

A: Given, mean µ = 202 standard deviation (σ) = 38.2  Let 'x' be a random variable i.e. x~Normal(µ,σ)…

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A: Given dataA psychologist wanted to know if students in her class were more likely to cheat if they…

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A: Note:"Since you have posted a question with multiple sub parts, we will provide the solution only to…

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: The objective of this question is to test the professor's claim that the mean test score of students…

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A: The objective of the question is to determine the degrees of freedom in a correlation analysis…

Q: Anyone who plays or watches sports has heard of the "home field advantage." Teams tend to win more…

A: Given Information: Sample size n=2431 Number of successes x=1319 Hypothesized value of population…

Q: Kimberly and Alexis began arguing about who did better on their tests, but they couldn't decide who…

A: Given data,For mathμ=76.8σ=9.9Kimberly score is X=76.4For Socialμ=62.6σ=9Alexis score is X=63.2

Q: When a data set has one or two values that are much higher than all of the others which of our 3…

A: As Mean is found by adding all the values and dividing by the number of values So if one or two…

Q: Of all of the possible samples, what proportion will show an average weight loss? In symbols, what…

A: The proportion would show an average weight loss is, PM<0=PM-μσn<0-964=Pz<-93=Pz<-3 The…

Q: Two students, Emily and Jeremy, go to different schools and want to find out who has a higher GPA…

A: Given data,

Q: In 1955, Life Magazine reported that a 25-year-old mother of three worked, on average, an 80 hour…

A: From the provided information, Sample size (n) = 71 Sample mean (x̅) = 83 Sample standard deviation…

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: The question is about hypo. testing Given : Randomly selected no. of students in evening class ( n1…

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: In hypothesis testing, we start by stating the null hypothesis (H0) and the alternative hypothesis…

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: n1=31,X1¯=5.5,σ1=1.4,σ2=1.1,α=0.01,n2=39

Q: Suppose you read in the newspaper that registered nurses earned an average annual salary of $49,110…

A: Claim :  salary was significantly lower than the $49,110.

Q: Angela and Carissa began arguing about who did better on their tests, but they couldn't decide who…

A:

Q: The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the…

A: From the provided information, Sample size (n) = 250 She would now like to determine whether or not…

Q: A psychologist wanted to know if students in her class were more likely to cheat if they were low…

A: A descriptive statistic is a summary statistic that quantitatively describes or summarizes features…

Q: imagine you’re hired by a beef company called “American Beef Makers” as a Data Analyst and you’re…

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

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: Let mean numbers of calls for Karen’s is µ1 and mean numbers of calls for Jodi’s is µ2.

Q: In 2009, it was estimated that 63% of Americans supported the death penalty. In 2014, a Rasmussen…

A: sample size(n)=943 No. of Americans supported the death penalty(x)=536 population proportion=0.63

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: The sample means are 5.2 and 4.5.

Q: If the mean of the number of sales of houses is fifty-six, and the standard deviation is thirty-six,…

A: We have given, The mean number of sales of houses is x¯=56. And the standard deviation is σ=36.

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: The given values are:Sample size for Karen (n1) = 32Sample mean for Karen (x̄1) = 5.5Population…

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: From the provided information,

Q: A class of 5 students averaged 70% on a given test. A class of 9 students averaged 80% on the same…

A: Introduction: Suppose there are k groups numbered 1, 2, 3, …, k – 1, and k.

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: The given claim is that the mean test score of students in the evening classes is lower than the…

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

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

Q: A developmental psychologist interested in relationships developed a questionnaire that measures the…

A:

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: From the provided information,

Q: researcher collects data from 30 different individuals and wants to understand the correlation…

A: the sample size is n=30

Q: Test the claim that there is a difference between the mean numbers of calls for the two shifts at…

A: Given that For Karen, sample size n1 = 41, sample mean = 5.1 and population SD = 1.5 For Jodi,…

Q: Lucille, Rocio, and Cristina are all taking College Mathematics but from different professors. They…

A: Lucille's class had an average grade of 85 and the standard deviation was 3. Lucille earned 89.5 on…

Q: 8. Rachel Ray has a popular FoodNetwork show, 30 Minutes Meals. However, in a study conducted by USA…

A: given that

Q: Before going to college, Chelsea wanted to see if she could sell her old car online. She selected a…

A: Given, She selected a sample of the price on 25 similar car sold online in the past month. Chelsea…

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

Q: (b) Based on your sample, graph the 95% confidence interval for the population mean of all the…

A:

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: The following information is given:For evening class:The sample size, n1=150The sample mean,…

Q: A notable indicator of a baby's health is the weight gained in the first year of the baby's life.…

A: From given data we have ;   sample size =15 Point estimate  = 5.658 standard deviation =1.869   here…

Q: A professor believes that, for the introductory art history classes at his university, the mean test…

A: The question is about hypothesis testing.Given :Randomly selected no. of students in the evening…