9.The means and standard deviations of room rates for 50 billing statements fromeach of the computer database of the Marriot and Westin hotels are given in thefollowing table.MarriotWestinSample means16515030Sample standard deviations35Find a 98% confidence interval for the difference in the average room rates forthe Marriot and the Westin Hotels. Is there a possibility of no difference in theaverage room rates?(-30.19, 0.19); Yes(-30.19, 0.19); No(-27.78, -2.22); No(-31.82, 1.82); YesABCDA.B.C.D.

Given,For Marriot :sample size (n1) = 50sample mean (x̄1) = 150sample standard deviation (s1) =…

Answered: each of the computer database of the…

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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In a medical examination, 300 people undergo a height measurement and was found out that the average height of all are 150cm. If the standard deviation is 19, find the number of people that fall under the given conditions: With height less than 132cm. With height from 140 cm to 180 cm With height taller than 200 cm With height from 160cm to 195 cm With height from 150 cm to 200cm Determine the range of the height that includes the central 60% 45% of the people who undergo the medical examinations are qualified to be part of the varsity. What is the limit height to be part of the varsity?
The mean change in muscle thickness observed after a 4-week training regimen was 4 mm, and the 95% confidence interval (CI) for mean change was (-0.5, 8.5). Which is the best scientific conclusion for the effectiveness of this regimen ?
The length of preg…
. Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout. Suppose a friend tells you that the average length of trout caught in Pyramid Lake is ? = 19 inches. However, the Creel Survey reported that of a random sample of 49 fish caught, themean length was ?̅= 18.5 inches, with estimated standard deviation ? = 3.2 inches. Do these data indicate that the average length of a trout caught in Pyramid Lake is less than ? = 19 inches? Use ? = 0.05.a. Do we use a Normal or a Student’s t- distribution? Explain. How many degrees of freedom do we use?b. What are the hypotheses?
A telemarketing company knows that the daily average sales is 20. A new telemarketer who has just started with the company claims that the target of 20 sales per day is an unreasonably high target. From the 100 telemarketers working for you, you select a random sample of 16 and calculate the mean and the standard deviation of sales for a day to be 18.5 and 3.2 respectively. Is there any validity in the statement made by the new telemarketer? Test at the 5% level of significance.
a group of 59 randomly selected students have a mean score of 29.5 with a standard deviation of 5.2 on a placement test. what is the 90% confidence interval for the mean score, u, of all students taking the test?
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A study is conducted to compare the performance of students with more than one personal electronic gadget and those with only one. A number of them were taken as subjects for the study. The mean grades of these students and the standard deviations are shown below: For one gadget: The mean is 83, standard deviation is 12, and sample size is 7. For more than one gadget: The mean is 79, standard deviation is 13, and sample size is 5. Is it possible to conclude that there is no significant difference in the mean grades of the two types of students at a 95% confidence interval? Note: This is a two-tailed test. Also take note that this is finding the difference between two population means.
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 = [__.__ , __.__]
A sample of 36 corn plants represent the height of corn in a corn field. The sample mean of corn height is 68 cm. If the population standard deviation is 3 cm, find a 99% confidence interval for the true mean height of corn.
suppose that for a sexually active male drosophila fruit fly in a particular genetics lab the population mean lifespan is 38.9 days with a population standard deviation of 12.0 days when she experimentally removed all females from a simple random sample of 24 this drosophila flies in her lab a researcher in the slab found that 24 sexually inactive males had a mean lifespan of 62.5 days with a standard deviation of 14.1 days answer the questions below about the experiment and about testing weather sexual activity affects how long males Drosophila live. How do you find the Critical Value? How do you find theP-Value? reject or fail to reject the null hypothesis?

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