Suppose a random sample size of 60 is taken from a population with p = 0.51. What is the mean of sample proportions? 0.49 0.51 0.50 0.60
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- Using these reading scores 7, 7, 14, 9, 10, 8, 11, 14, 13, 14, 15, 15 and knowing the mean of the reading scores is 11.42 Find the standard deviation of the reading scoresConstruct 95% confidence for the population point estimate (sample proportion) which is given as P=0.4 N = 40 Be sure to check for normality of the sampling distribution.deniation 4. About 10% of people in the United States do not wear a seat belt. Suppose we plan to select a random sample of 180 U.S. residents. Let = the proportion of people in the sample who do not wear their seat belt. a. Calculate the mean and standard deviation of the sampling distribution of p. b. Interpret the standard deviation. c. Justify that the sampling distribution of p is approximately normal. d. What is the probability that at least 15% of the individuals
- 24Use technology to help you test the claim about the population mean, p, at the given level of significance, a, using the given sample statistics. Assume the population is normally distributed. Claim: u > 1280; a = 0.07; o = 196.31. Sample statistics: x= 1308.11, n= 200 H p> 1280 Ha: p 1308.11 O D. Ho: Hs 1308.11 Ha ps 1308.11 Ha: p> 1308.11 O E. H, p> 1280 O F. Ho: µ2 1280 Ha: u< 1280 Ha ps 1280 Calculate the standardized test statistic. The standardized test statistic is 2.03. (Round to two decimal places as needed.) Determine the P-value. P 3D (Round to three decimal places as needed.)1- Computer Literacy Test If 80% of job applicants are able to pass a computer literacy test, find the mean, variance, and standard deviation of the number of people who pass the examination in a sample of 150 applicants. 2- Fuel Efficiency for U.S. Light Vehicles The average fuel efficiency of U.S. light vehicles (cars, SUVS, minivans, vans, and light trucks) for 2005 was 21 mpg. If the standard deviation of the population was 2.9 and the gas ratings were normally distributed, what is the probability that the mean mpg for a random sample of 25 light vehicles is under 20? Between 20 and 25? 3- Elementary School Teachers Women comprise 80.3% of all elementary school teachers. In a random sample of 300 elementary chers, what is the probability that less than three-fourths are women?
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- Assume the samples are random and independent, the populations are nomally distributed, and the population variances are equal. The table available below shows the prices (in dollars) for a sample of automobile batteries. The prices are classified according to battery type. At a = 0.10, is there enough evidence conclude that at least one mean battery price is different from the others? Complete parts (a) through (e) below. E Click the icon to view the battery cost data. (a) Let u1. P2. H3 represent the mean prices for the group size 35, 65, and 24/24F respectively. Identify the claim and state Ho and H. H Cost of batteries by type The claim is the V hypothesis. Group size 35 Group size 65 Group size 24/24F 101 111 121 124 D 146 173 182 278 124 140 141 89 (b) Find the critical value, Fo, and identify the rejection region. 90 79 84 The rejection region is F Fo, where Fo = (Round to two decimal places as needed.) (c) Find the test statistic F. Print Done F= (Round to two decimal places as…To build a 95% CI for the mean of a population, you take a random sample and find these values: 18.4 19.8 17 18.6 23 21.7 18.9 14.3 17.6 21.2 21.4 23.4 20 20.7 15.2 21.9 21 What is the CI? Enter like this: (min,max) Be sure to use the parentheses or you will be marked wrong. Keep at least 3 decimals in all intermediate steps, and round your answer to two decimals. Submit QuestionSuppose that the efficacy of a certain drug is 0.49. Consider the sampling distribution (sample size 166) for the proportion of patients cured by this drug. n = a. What is the mean of this distribution? b. What is the standard error of this distribution? Round the answer to three decimal places. ent Submit Question ry ent with
