Question 5>Past surveys indicate that 58% of Americans personally worry a great deal about federal spending and thebudget deficit. Would it be considered unusual to have a random sample of 193 Americans where 143 of thempersonally worry a great deal about federal spending and the budget deficit? (We say that any observationmore than 2 standard deviations from the mean is unusual.)ооYesNoCannot tell from the information given

According to the given information, we have Sample size, n = 193 Probability, p = 58% = 0.58 x = 143

Answered: Past surveys indicate that 58% of…

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
The general population (Population 2) has a mean of 30 and a standard deviation of 5, and the cutoff Z score for significance in a study involving one participant is 1.96. If the raw score obtained by the participant is 45, what decisions should be made about the null and research hypotheses?
Many people consider their smart phone to be essential! Communication, news, Internet, entertainment, photos, and just keeping current are all conveniently possible with a smart phone. However, the battery better be charged or the phone is useless. Battery life of course depends on the frequency, duration, and type of use. One study involving heavy use of the phones showed the mean of the battery life to be 11.25 hours with a standard deviation of 3.3 hours. Then the battery needs to be recharged. Assume the battery life between charges is normally distributed. (a) Find the probability that with heavy use, the battery life exceeds 12 hours. (Round your answer to four decimal places.)(b) You are planning your recharging schedule so that the probability your phone will die is no more than 5%. After how many hours should you plan to recharge your phone? (Round your answer to the nearest tenth of an hour.) hours
Suppose that IQ scores have a bell shaped distribution with a mean up 104 and a standard deviation of 17. Using the empirical rule, what percentage of accused scores are between 70 and 138?
11. Ed had a mark of 75 out of 80 on a test, which had a mean mark of 60 and a standard deviation of 7.5. Sam had a mark of 78 out of 90 on a test, which had a mean mark of 66 and a standard deviation of 6.0. Statistically, who had the better mark compared to the rest of his class? A Ed had a better mark. B Sam had a better mark C You cannot tell who did better with the given information. D The two scores are statistically the same. 12. Anil received the following marks on his first five biology tests: 75, 84, 92, 61, and 79. What test score must Anil earn on his sixth test so that his mean mark for all six tests will be 80? 75+84 +92 +61 +79
13)Many graduate schools require applicants to take the GRE for admission. The mean GRE score worldwide is 149.7 with a standard deviation of 8.2. The recommended overall GRE score for admission at UC Berkeley is 153 Q) If an applicant were to obtain a score of 123, how many standard deviations away is this score from the mean?
11. If the scores for an IQ Test have a mean of 100 and a standard deviation of 15, find the probability of a student having an IQ score that will fall below 112.
2. When we carry out a 1-sample hypothesis test for the mean, one of the ways that we can check for normality is to look at the normal plot. How do we know if our normality assumption is satisfied by looking at the normal plot? Be as specific as possible.
Researchers collected data on the numbers of hospital admissions resulting from motor vehicle crashes, and results are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Use a 0.05 significance level to test the claim that when the 13th day of a month falls on a Friday, the numbers of hospital admissions from motor vehicle crashes are not affected. Friday the 6th: Friday the 13th: 10 10 13 11 13 69 11

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