V 5.a. The females who read the "great sense of humor" description gave the potential partneran average attractiveness score of M-4.53 with a standard deviation of s=1.04. If the sampleconsisted of n=16 participants, is the average rating significantly higher than neutral (u-4)use one tailed test with d=0.05.Y 5.b. Draw a frequency curve:X: 10-20,20-30,30-40,40-50,50-60,60-70f: 4,6,10,7,5,3143 - 219- 26I9 - 120

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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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8. Test the claim that the standard deviation of the systolic blood pressure of adults aged 40-50 is equal to 22mmHg. The sample statistics are as follows: n=23, x¯ = 132.3mmHg, and s = 26.7. Use a significance level of 0.05. Assume the sample was randomly collected from a normally distributed population. Show work.
Suppose we have the following data collected from three randomly-selected counties: 1.What is the sample mean of x? Of y? 2.What is the sample standard deviation of x? Of y? (2 decimal places) 3.Please compute the sample correlation coefficient, r. (4 decimal places) County % with HS Degree (x) % in Poverty (y) A 90 5 B 20 25 C 40 15
Assume that adults have IQ scores that are normally distributed with a mean of 98.4 and a standard deviation 20.5. Find the first quartile Upper Q 1 , which is the IQ score separating the bottom 25% from the top 75%. a. The first quartile is (Type an integer or decimal rounded to one decimal place as needed.)
A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a mean different than the 600mg claimed by the manufacturer. Test this claim at the .01 significance level. The mean acetaminophen content for a random sample of n = 29 tablets is 597.9 mg with a standard deviation of 3.8 mg. What are the hypotheses? What is the test statistic? Is it a z or a t? Find the P-value for this test statistic. How does it compare to the significance level? On the normal curve, indicate the location of the test statistic and the p-value. (label them on the graph) Write a conclusion in statistical terms and relate it to the parameters of this problem.
A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
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Justine is an analyst for a sleep study center. She believes that the average adult in a certain city spends more than 7.2 hours sleeping daily. To test this claim, she selects a random sample of 63 adults from the city. The following is the data from this study: The alternative hypothesis Ha:μ>7.2. The sample mean number of hours slept per night by the 63 adults is 7.52 hours. The sample standard deviation is 1.14 hours. The test statistic is calculated as 2.23. Using the information above and the portion of the t− table below, choose the correct p− value and interpretation for this hypothesis test. Values for right-tail areas under the t-distribution curve Probability 0.10 0.05 0.025 0.01 0.005 Degrees of Freedom 60 1.296 1.671 2.000 2.390 2.660 61 1.296 1.670 2.000 2.389 2.659 62 1.295 1.670 1.999 2.388 2.657 63 1.295 1.669 1.998 2.387 2.656 64 1.295 1.669 1.998 2.386 2.655 65 1.295 1.669 1.997 2.385 2.654 66 1.295 1.668 1.997 2.384 2.652…
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