MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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(b) Find a 90% confidence interval for the P/E population
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- 2/12 decide if a 90% T interval can be constructed about the population mean. If not, state the reason why.arrow_forwardEmpirical research on stock market data for two consecutive trading days indicates that 60% of the stocks that went up on the first day also went up on the second day. Yesterday, 600 stocks went up. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p gives the proportion of the 600 stocks that went up yesterday that will go up today. (b) Find the standard deviation of p. (c) Compute an approximation for P(p > 0.56), which is the probability that more than 56% of the stocks that went up yesterday will go up again today. Round your answer to four decimal places.arrow_forwardWorking backwards, Part I: A 95% confidence interval for a population mean, μ, is given as (18.985, 21.015). This confidence interval is based on a simple random sample of 36 observations. Calculate the sample mean, the margin of error, and the sample standard deviation. Assume that all conditions necessary for inference are satisfied. Use the t-distribution in any calculations. Round your answers to 3 decimal places.Sample Mean: Margin of Error: Standard Deviation:arrow_forward
- All 3 parts pleasearrow_forwardFind the probability that more than 68% of the sampled adults drink coffee daily.arrow_forwardBig chickens: A report from a poultry industry news Web site stated that the weights of broilers (commercialy are approximately normally distributed with mean 1446 grams and standard deviation 180 grams. Use the T1-84 PLUS calgulator and round your answers to at least two decimal places. ickens) (a) Find the 35 percentile of the weights. nd (b) Find the 92 percentile of the weights. (c) Find the second quartile of the weights. (d) A chicken farmer wants to provide a money-back guarantee that his broilers will weigh at least a certain amount. What weight should he guarantee so that he will have to give his customers' money back only 1% of the time?arrow_forward
- Q1. Using 625 trading days of data, you estimated the daily log return follows a normal distribution with a mean of 5 bps and and a stdev of 125 bps. Q1b. what is the 90, 95, and 99% confidence interval for your mean return estimate?arrow_forwardEmpirical research on stock market data for two consecutive trading days indicates that 60% of the stocks that went up on the first day also went up on the second day. Yesterday, 600 stocks went up. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p gives the proportion of the 600 stocks that went up yesterday that will go up today. (b) Find the standard deviation of p. (c) Compute an approximation for P(p <0.58), which is the probability that fewer than 58% of the stocks that went up yesterday will go up again today. Round your answer to four decimal places.arrow_forwardProfessor Nord stated that the mean score on the final exam from all the years he has been teaching is a 79%. Colby was in his most recent class, and his class’s mean score on the final exam was 82%. Colby decided to run a hypothesis test to determine if the mean score of his class was significantly greater than the mean score of the population. α = .01. What is the mean score of the population? What is the mean score of the sample? Is this test one-tailed or two-tailed? Why?arrow_forward
- Stoaches are fictional creatures, sometimes mistaken for mome raths. Suppose a two-tailed t-test is conducted to test for a difference between the population means of adult female stoach weights and adult male stoach weights. The female sample has 13 weights, and the male sample has 7 weights. The t-statistic for the test is -0.20542. What is the p-value? (Give your answer to 4 decimal places.) p-value:arrow_forwardch.8 confidence interval mean A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 144 students who averaged 37.5 minutes concentrating on their professor during the hour lecture. The standard deviation was 11.3 minutes. b. With 98% confidence the population mean minutes of concentration is between (round to 3 decimal places) _____ and _____ minutes. c. If many groups of 144 randomly selected members are studied, then a different confidence interval would be produced from each group. About _____ percent of these confidence intervals will contain the true population mean minutes of concentration and about _______ percent will not contain the true population mean minutes of concentration.arrow_forward
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