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
Please answer question 9.1
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
3.1 In a study, serum cholesterol levels were measured for a large number of healthy males. The population wasfollowed for 16 years. At the end of this time, the men were divided into two groups: those who had developedcoronary heart disease and those who had not. The distributions of the initial serum cholesterol levels for eachgroup were found to be approximately normal. Among individuals who eventually developed coronary heartdisease, the mean serum cholesterol level was µa=244 mg/100 ml and the standard deviation was od=51 mg/100 ml; for those who did not develop the disease, the mean serum cholesterol level was und = 219 mg/100 ml andthe standard deviation was ond = 41 mg/100 ml.a) Suppose that an initial serum cholesterol level of 260 mg/100 ml or higher is used to predict coronary heart disease. What is the probability of correctly predicting heart disease for a man who will develop it?b) What is the probability of predicting heart disease for a man who will not develop it?
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…
3.10 The survey on student attitude toward e-books described in Exercise 3.5 was conducted in 2011. A similar survey was also conducted in 2012 (The Chronicle of Higher Education, August 23, 2013). Data from 1588 students who participated in the 2012 survey are summarized in the accompanying table. Response Percentage in This Category Strongly disagree 19.1 Disagree 27.5 Agree 26.3 Strongly agree 16.0 Don't know 11.1 a. Use these data and the data from Exercise 3.5 to construct a comparative bar chart that shows the distribution of responses for the two years. (Hint: See Example 3.1.) b. Based on your graph from part (a), do you think there was much of a change in attitude toward e-books from 2011 to 2012?
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…
Please answer question 9.3
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

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