A SCUBA instructor wants to record the collective depths each of his students' dives during their checkout. He is interested in how the depths vary, even though everyone should have been at the same depth. He believes the standard deviation is three feet. His assistant thinks the standard deviation is less than three feet. If the instructor were to conduct a test, what would the null and alternative hypotheses be?

Q: In a survey, 12 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: The average room rate for a hotel in a city in 2016 was $347. Suppose the city's Chamber of Commerce…

A: According to the given information in this question we are going to find test statistic and p value…

Q: d. How many clamps must be sampled so that a 95% confidence interval specifies the mean to within ±1…

A: The objects whose characteristics are studied are called units. This total unit under consideration…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: Jill only receives surveys from 386 people despite expecting to receive 500 surveys. How will this…

A: Since we know that margin of error is defined for Unknown population standard deviation is and the…

Q: Making sure that the scales used by businesses in the United States are accurate is the…

A: Population mean (µ) = 1000Standard deviations (σ) = 2Sample size (n) = 47Sample mean (x̅) =…

Q: In 2018, the mean age of a student at Cypress College was 25 years old. The President of the school…

A:

Q: chi square analysis, the larger the difference between expected and observed frequencies, the more…

A: The Chi-square test is a test for categorical variables which determines whether there is a…

Q: In a large university, 77% of the students live in the dormitories. A random sample of 110 students…

A: Given that,  The proportion us p= 77% = 0.77 And sample size is n= 110 So X~ Binomial (110,0.77)

Q: 5. A random sample of 43 foreign language movies made since the year 2000 had a mean length of 112.5…

A: Here, the parent distribution from which the sample is taken is unknown and also, the population…

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: given data σ = 50.798% ci for μ.E = 5n = ?

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=20mean(x¯)=46standard deviation(s)=10α=1-0.99=0.01α2=0.005Degrees of…

Q: A history teacher records the SAT scores of all 87 of her students. The data is used to construct a…

A: For calculating the confidence interval, we need to satisfy the following conditions: Independence…

Q: Use the information below to answer Questions #6 and #7. You are given the sample mean and the…

A:

Q: An existing inventory for a test measuring self-esteem indicates that the scores have a standard…

A:

Q: QUESTION 9 Alfred, Bruce, and Selina each construct a confidence interval from the same sample.…

A: The question is based on the relationship between the confidence level and width of confidence int.…

Q: The population standard deviation for the temperature of beers found in Scooter's Tavern is 0.21…

A: Given that, Population standard deviation = 0.21 Margin of error = 0.1 90% confidence level

Q: 1. A sample of forty tuna showed that they can swim an average of 8.6 miles per hour. The standard…

A: According to Bartleby's guidlines we can solve only one question.Given that,The sample size  is…

Q: 10. A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The…

A: Given that  x̄ = 280 ,  ? = 66 , n = 121 Note: According to bartleby experts question answers…

Q: We want to compare cholesterol levels between men and women, so we collect a sample of 20 women and…

A: From the provided information,

Q: Question 2: You measure 40 backpacks' weights, and find they have a mean weight of 64 ounces. Assume…

A:

Q: Many people believe that the average number of Facebook friends is 140. The population standard…

A: The population standard deviation is given as 37.9 The sample size n= 39 The sample mean x¯ = 152

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: σ =   27.990% confidence interval for μ.E = 1n = ?

Q: For student loans in a particular year, the standard deviation is $2 thousand. A random sample of…

A: Given information Standard deviation σ = 2 Sample size n = 100

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: Jamie, a recruiter, claims that her recruits' entrance exam score is less than 168 points, on…

A: From the provided information, The hypotheses are as follow: H0: µ ≥ 168 Ha: µ < 168 Sample size…

Q: Bob draws a simple random sample from a massive original population. The sample size is n=41 and the…

A:

Q: A researcher wishes to test the claim that the average cost of tuition and fees at a four year…

A:

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=25Mean(x)=36standard deviation(s)=3confidence level = 99%

Q: how many beers must we sample? Round to the nearest beer.

A:

Q: A population has a mean μ=79and a standard deviation σ=14. Find the mean and standard deviation of a…

A: We have to find sampling distribution

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: