Stats For Behav. Science W/mindtap
10th Edition
ISBN: 9781337367691
Author: GRAVETTER
Publisher: Cengage
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Chapter 6, Problem 19P
- A report in 20 l0 indicates that Americans between the ages of 8 and 18 spend an average of µ=7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets. Assume that: the distribution of times is normal with a standard deviation of
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Chapter 6 Solutions
Stats For Behav. Science W/mindtap
Ch. 6 - What are the two requirements for a random sample?Ch. 6 - Define sampling with replacement and explain why...Ch. 6 - Around Halloween each year the grocery store sells...Ch. 6 - A psychology class consists of 28 males and 52...Ch. 6 - 5. Draw a vertical line through a normal...Ch. 6 - Draw a vertical line through a normal distribution...Ch. 6 - Find each of the following probabilities for a...Ch. 6 - S. What proportion of a normal distribution is...Ch. 6 - Find each of the following probabilities for a...Ch. 6 - 10. Find the z-score location of a vertical line...
Ch. 6 - Find the z-score boundaries that separate a normal...Ch. 6 - A normal distribution has a mean of =70 and a...Ch. 6 - 13. A normal distribution has a mean .of µ=30 and...Ch. 6 - For a normal distribution with a mean of =60and a...Ch. 6 - 15. In 20l4, the New York Yankees had a team...Ch. 6 - 16. IQ test scores are standardized to produce a...Ch. 6 - The distribution of scores on the SAT is...Ch. 6 - 18. According to a recent report, people .smile an...Ch. 6 - A report in 20 l0 indicates that Americans between...Ch. 6 - , Rochester, New York, averages µ = 2 l .9 inches...Ch. 6 - A multiple-choice test has 32 questions, ,each...Ch. 6 - A true/false test has 20 questions. If a student...Ch. 6 - A roulette wheel has alternating red and black...Ch. 6 - A test developed to measure ESP involves using...Ch. 6 - The student health clinic reports that only 30%,...
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- Suppose a random sample of 459 married couples found that 307 had two or more personality preferences in common. In another random sample of 471 married couples, it was found that only 31 had no preferences in common. Let p1 be the population proportion of all married couples who have two or more personality preferences in common. Let p2 be the population proportion of all married couples who have no personality preferences in common. Find a95% confidence interval for . Round your answer to three decimal places.arrow_forwardA history teacher interviewed a random sample of 80 students about their preferences in learning activities outside of school and whether they are considering watching a historical movie at the cinema. 69 answered that they would like to go to the cinema. Let p represent the proportion of students who want to watch a historical movie. Determine the maximal margin of error. Use α = 0.05. Round your answer to three decimal places. arrow_forwardA random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 99% sure that the point estimate will be within a distance of 0.07 from p? Round your answer to the next higher whole number.arrow_forward
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- iid 1. The CLT provides an approximate sampling distribution for the arithmetic average Ỹ of a random sample Y₁, . . ., Yn f(y). The parameters of the approximate sampling distribution depend on the mean and variance of the underlying random variables (i.e., the population mean and variance). The approximation can be written to emphasize this, using the expec- tation and variance of one of the random variables in the sample instead of the parameters μ, 02: YNEY, · (1 (EY,, varyi n For the following population distributions f, write the approximate distribution of the sample mean. (a) Exponential with rate ẞ: f(y) = ß exp{−ßy} 1 (b) Chi-square with degrees of freedom: f(y) = ( 4 ) 2 y = exp { — ½/ } г( (c) Poisson with rate λ: P(Y = y) = exp(-\} > y! y²arrow_forward2. Let Y₁,……., Y be a random sample with common mean μ and common variance σ². Use the CLT to write an expression approximating the CDF P(Ỹ ≤ x) in terms of µ, σ² and n, and the standard normal CDF Fz(·).arrow_forwardmatharrow_forward
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