Suppose a study reported that the average person watched 5.71 hours of television per day. A random sample of 15 people gavethe number of hours of television watched per day shown. At the 1% significance level, do the data provide sufficient evidence toconclude that the amount of television watched per day last year by the average person differed from the value reported in thestudy? (Note: x= 4.573 hours and s = 1.233 hours.)4.25.52.1 D5.94.44.43.85.62.45.86.04.33.55.35.4.....Set up the hypotheses for the one-mean t-test.Ho: H5.715.71The test statistic is t= - 3.57.(Round to two decimal places as needed.)The P-value is.(Round to three decimal places as needed.)545 6s

Answered: Image /qna-images/answer/715ffac9-0f2f-42df-8187-d61205937e4f.jpg

Answered: 5.5 2.1 Suppose a study reported that…

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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Labor day was created by the U.S. labor movement over 100 years ago. In a recent Gallop Poll, 1010 randomly selected adults were asked whether they approve of labor unions. 680 said yes. In 1936, 72% of Americans approved of labor unions. At the 1 % significance level, do the data provide sufficient evidence to claim that the percentage of Americans who approve of labor unions has decreased since 1936? H0: _____________ check criteria: HA: ___________ Label the claim next to the correct hypothesis above. Check the criteria for using a z test. Critical value_________ Test statistic (show work) Decision______________________________ Include a sketch supporting your decision. Conclusion in your own words
At the .01 significance level, does the data below show significant correlation? x y5 306 26.377 17.848 24.019 19.9810 20.8511 17.9212 18.5913 18.0614 18.1315 20.6Yes, significant correlationNo
8.7
In a population of bats living in a certain region, 30 percent have a wingspan greater than 10 inches. In a random sample of 80 bats living outside of the region, 20 had a wingspan greater than 10 inches. Consider a one-sample z-test to investigate whether there is evidence that the proportion of bats with a wingspan greater than 10 inches living outside the region is different from that of the bats living in the region. Which of the following is the correct test statistic? 0.30-0.25 A (0.25)(0.75) 0.30 0.25 2 = (0.30)(0.70) 0.20 0.30 (0.30) (0.70) 0.25 0.30 D (0.25) (0.75) 0.25 0.30 E (0.30)(0.70) 80
Use Table 13.1 “How Relationship Strength and Sample Size Combine to Determine Whether a Result Is Statistically Significant” (Links to an external site.) to decide whether each of the following results is statistically significant. Please also explain why you determined whether or not the results are statistically significant. The correlation between two variables is r = −.78 based on a sample size of 137. The mean score on a psychological characteristic for women is 25 (SD = 5) and the mean score for men is 24 (SD = 5). There were 12 women and 10 men in this study. In a memory experiment, the mean number of items recalled by the 40 participants in Condition A was 0.50 standard deviations greater than the mean number recalled by the 40 participants in Condition B. In another memory experiment, the mean scores for participants in Condition A and Condition B came out exactly the same! A student finds a correlation of r = .04 between the number of units the students in his research…
Because of the popularity of movies as an entertainment medium for college students, you plan to do a national study of the average cost of a movie ticket. If you assume that σ=$0.50, what sample size would you have to take to be 95% confident that your estimate was within $0.25 of the true mean ticket prices
1. Metal Tags on Penguins and Length of Foraging Trips. Data were collected over a 10-year timespan from a sample of penguins that were randomly given either metal or electronic tags. One variable examined is the length of foraging trips. Longer foraging trips can jeopardize both breeding success and survival of chicks waiting for food. From a sample of 344 foraging trips for metal-tagged penguins, the mean length was 12.70 days. From a sample of 512 foraging trips for electronic-tagged penguins, mean length was 11.60 days. Test whether foraging trips are longer on average among metal-tagged penguins than among electronic-tagged penguins. a. State hypotheses in terms of two means. b. Calculate the sample statistic XM - XE c. An estimate of the standard error for this difference of means is SE-0.2834. Calculate a test statistic to two decimal places. d. What is the correct theoretical distribution for this test? ☐Normal ☐t with degrees of freedom e. Find the p-value and draw a…
Suppose that you have to decide if the mean of the light bulbs last longer than 150 hours. You choose a random sample of 14 bulbs of each brand. What decision should you make at the 5% significance level (alpha = 0.05)? 128 189 139 148 186 141 163 101 195 142 174 114 196 191 a. z = -2.576 b. t = +1.796 c. t = + 1.771 d. z = + 1.796
Suppose a study reported that the average persin watched 3.37 hours of television per day. a random sample of 15 people gave the number of hours of television watched per day shown below. at the 1% significance level, do the data provide sufficent evidence to conclude that the amount of television watched per day last year by the average person is greater than the value reported in the study? what is the test statistic value for this problem? a.0.28 b.-38 c.none of the above d. 0.58 e.-4.295 f..04 g. 1.94 . the proper conclusion for this problem is? a. reject the null hypothesis we have sufficent evidence to prove the average number of hours people watch tv is more than 3.37 hours. b. Do not reject the null hypothesis we have sufficient evidence to prove the average number of hours of TV watched is greater than 3.37 hours c. Reject the null hypothesis and claim the average number of hours people watch TV is less than 3.37 because the P value is near zero d. Do not reject the null…
9.1 Q5
A middle school teacher believes that a reading rewards program results in a higher number of pages read per year after the program is completed. The teacher chooses a simple random sample of students and records the number of pages read per year before starting the program and after the program is completed. The results of the study are below What are the population parameters? Pick Before 813.25 192250.25 182875.22 After 904.95 What is the level of significance? Ex: 0.12 Mean Variance Observations Hypothesized Mean Difference 100 100 Is the two-sample hypothesis test a paired or unpaired t-test? Pick 198 t Stat P[T< t) one-tail tCitical one-tail P[T<=t) two-tail t Critical two tal Confidence Level What is the null hypothesis Ho? Pick 0.068 1.653 What is the alternative hypothesis H.? Pick 1.972 95% Should Ho be rejected or does Ho fail to be rejected? Pick What conclusion can be drawn from the data? Pick v evidence exists to support the claim that the mean number of pages read per…
5.28 Risks and insurance. The idea of insurance is that we all face risks that are unlikely but carry high cost. Think of a fire destroying your home. So we form a group to share the risk: we all pay a small amount, and the insurance policy pays a large amount to those few of us whose homes burn down. An insurance company looks at the records for millions of homeowners and sees that the mean loss from fire in a year is μ = $250 per house and that the standard deviation of the loss is σ = $1000. (The distribution of losses is extremely right-skewed: most people have $0 loss, but a few have large losses.) The company plans to sell fire insurance for $250 plus enough to cover its costs and profit. If the company sells 25,000 policies, what is the approximate probability that the average loss in a year will be greater than $270?

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