Question 4A statistician chooses 20 randomly selected dates, and when examining the occupancy records of aparticular motel for those dates, finds a mean number of rooms rented to be 139.3 with a standarddeviation of 13.82 rooms rented. Assume that the number of rooms rented is normally distributed. Choosethe appropriate procedure for constructing a 90% confidence interval for the standard deviation of thenumber of rooms rented.i. Procedure: Select an answerSelect an answerOne mean Z procedureOne variance x² procedureOne proportion Z procedureOne mean T procedureRECEPTIONii. Assumptions: (select everything that applies)Sample size is greater than 30Population standard deviation is knownSimple random sampleThe number of positive and negative responses are both greater than 10Population standard deviation is unknownO Normal populationiii. Unknown parameter:Select an answerSelect an answerp, population proportion0², population varianceμ, population mean

We have given that, Sample size (n) = 20, sample mean (x̄) = 139.3 and standard deviation (s) =…

Answered: N an chooses 20 randomly selected…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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2. Hypothesis: A one hour GRE workshop increases test scores. Sample Data: Mean of 25 people who did workshop = 156 (standard deviation = 8.2); mean of 27 people who did not do workshop = 154 (standard deviation 7.6).
One-Way Airfares The average one-way airfare from Pittsburgh to Washington D.C. is $236. A random sample of 19 one-way fares during a particular month had a mean of $208 with a standard deviation of $43. At α=0.05, is there sufficient evidence to conclude a difference from the stated mean?
select which of the three is correct
PLEASE ONLY SELECT THE ANSWERS AS SHOWN FOR THE MULTIPLE CHOICE, SUCH AS OPTION 1, 2, ETC. 1) In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.8 and a standard deviation of 1.51. Use a 0.10 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. What are the null and alternative hypotheses? A. H0: μ=0 mg/dL H1: μ<0 mg/dL B. H0: μ>0 mg/dL H1: μ<0 mg/dL C. H0: μ=0 mg/dL H1: μ≠0 mg/dL D. H0: μ=0 mg/dL H1: μ>0 mg/dL…
Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 4 inches. The heights of 9 randomly selected students are 72, 61, 65, 64, 61, 67, 71, 63 and 72. x¯ =? Margin of error at 90% confidence level =? 90% confidence interval = [__.__ , __.__]
Find Test Statistic, P value, and Z score.
1. It is the most reliable measure of variation or dispersion? choose: Range Standard deviation Mean deviation Variance 2.The weights of ripe watermelons at Mr. Pakwan's farm are normally distributed with a standard deviation of 1.4 kg. Find the mean weight of Mr. Pakwan's ripe watermelons if only 3% weigh less than 3.5 kg. choose: 5.28 kg 3.61 kg 6.13 kg 4.90 kg thanks
13.34 Women's heights. The heights of adult women are approximately Normal with mean 69.2 inches and standard deviation 2.5 inches. How tall are the tallest 10% of women? (Use the closest percentile that appears in Table B.)

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