In a survey, 16 people were asked how much they spent on their spouses last birthday gift. The results were roughly bell-shaped with a mean of $35 and standard deviation of $3. Construct and interpret a 90% confidence interval. Give your answers to one decimal place. Interpretation:

Q: In a multiple-choice examination in Chemistry, students Mae and Julie received scores of 82 and 65,…

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

Q: The mean value of land and buildings per acre from a sample of farms is $1500, with a standard…

A: The mean is 1500 and the standard deviation is 300.

Q: The college physical education department offered an advanced first aid course last summer. The…

A: Given data is appropriate to find z-score for the given data .A Z-score is a numerical measurement…

Q: A random sample of 54 four-year-olds attending day care centers provided a yearly tuition average of…

A: Given n=54 X-bar=3912 Standard deviations=615

Q: At a=0.05, what is the critical value? -1.984 1.66 -1.645 -1.66

A:

Q: Russell is doing some research before buying his first house. He is looking at two different areas…

A: Formula : CI=(x̄1 - x̄2) ± ME

Q: If you have 100 people in your sample, what would be the degrees of freedom you use to calculate the…

A: Given, n=100 Degree of freedom(df)=?

Q: Use the sample mean(78.5)and sample standard deviation (12.3671)in your calculations below. Use…

A: Given that:

Q: Gradebook Data Sets eText Multimedia Library 77°F Sunny A certain statistics instructor participates…

A:

Q: The average daily points for my fantasy baseball team are {4.1, 5.7, 3.8, 4.7, 4.7, 5.5, 4.1, 2.7,…

A: Solution: Note: Hello! As you have posted more than 3 sub parts, we are answering the first 3…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: A car salesperson offers you a car at the price of $22,895. You look up the mean sales price for…

A: We have given that the random variable X that is sales price. Here, X = 22895 Mean = 21900 and…

Q: A marketing company wants to compare the effectiveness of two different advertising campaigns. They…

A: The null hypothesis is that there is no significant difference in the mean purchase amount between…

Q: Tom scored a 117 on a measure of math ability and a 41 on a measure of verbal ability. The means and…

A:

Q: What is the best estimate of the mean household income in this county?

A:

Q: The weight in pounds of a group of watermelons is given below: 6.3, 5.2, 7.8, 4.9, 8.1, 7.2, 5.8,…

A:

Q: that indicate Maggie’s Z scores on each test which are motor skills = -0.72, social skills = 1.21 &…

A: It is given that the preschool assessed the children’s motor skills, social skills and school…

Q: Safeway puts out hundreds of turkeys in the weeks before Thanksgiving each year. Each weight varies…

A: given data  μ = 15σ = 1.4Z = 1.2; x = ?

Q: Sandy gives the participants in her study a list of 24 words to remember. The mean an standard…

A: Given that:  The mean and standard deviation of the number of words recalled was 14 and 4…

Q: If a researcher were to increase a sample size from n = 30 participants to n = 80 participants, what…

A: Increase power

Q: The annual commissilons per salesperson employed by a retailer of mobile communication devices…

A: Let X be the random variable from normal distribution with mean (μ) = $ 41200 ans standard deviation…

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: You are applying for a job at two companies. Company A offers starting salaries with u = $28,000 and…

A:

Q: The Jimmy John’s store manager on Hwy. 46 wanted to know more about their customers.  She decides to…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Q: Janine is interested in how taking a computer science course affects the salary of college…

A: Introduction - Effect size =mean1-mean2standard deviation  t-test t-x-μsnwhere ,x=mean of the sample…

Q: a. The null and alternative hypotheses would be: Ho: Select an answer H₁: Select an answer Select an…

A: Given,two independent samples. - level of significance.The sub-parts need to be answered.

Q: The average travel time to work for a person living in Kokoma, Indiana, is 17  minutes.  Suppose the…

A: Solution: Let X be the average travel time to work for a person living in Kokoma  Indiana has normal…

Q: 27. Which is cheaper: eating out or dining in? The mean COSI bought at the grocery store is $13.04…

A: Given : μ = 13.04X = 12.75s = 2n = 100

Q: Lara coaches a kids netball team and has started tracking the players stats to help motivate them.…

A: Let X be a random variable and x follows binomial distribution. Then, n be the number of trials and…

Q: The current government economic survey wishes to know, with 96% confidence, the average household…

A:

Q: Given the set of data: (77, X. 75, 79, 79, X, 76, 75, X, 76}. If the unknown data X is the mode and…

A:

Q: On average 16 customers are served per hour in a bank serving point. What is the mean and standard…

A:

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

A: To find the z-score of Lamar's starting salary relative to the starting salaries of all entry-level…

Q: Maggie attends Happy Days preschool. The preschool assessed the children’s motor skills (i.e. the…

A: Given that: Maggie’s Z scores on each test are as follows: Test Z-scores Motor skills -0.72…

Q: rchers published a study that investigated the degree to which a country's households waste food.…

A:

Q: Maggie attends Happy Days preschool. The preschool assessed the children’s motor skills (i.e. the…

A: Given Information: The motor skills test has a class mean of 9.50 with a standard deviation of 1.25.…

Q: As of 2020, 83 pitchers have been inducted into the Major League Baseball Hall of Fame. The…

A: Given that, The number of winning games pitchers played is approximately normal with a mean of 250…

Q: The average teacher's salary in a particular state is  $54,194 . If the standard deviation is…

A:

Q: NCAA Scholarships. The NCAA estimates that the yearly value of a full athletic scholarship at…

A: GivenMean(μ)=19000standard deviation(σ)=2100

Q: A pharmaceutical company wants to test a new cholesterol drug. The average cholesterol of the target…

A:

Q: The following data set represents performance scores from a sample of participants in a psychology…

A: The formula to find sample standard deviation is as follows,  s = ∑ x2-∑x2nn-1

Q: In the 2014 MLB season the Los Angeles Dodgers won 94 games and lost 68 to finish in first place in…

A: Given information: The average is 4.43 runs per game and the standard deviation is 2.88 runs per…

Q: You are applying for a job at two companies. Company A offers starting salaries with p = $33,000 and…

A: The mean and standard deviation for Company A are 33,000 and 1,000. The mean and standard deviation…