The sampling distribution of the difference of two sample proportions is approximated by a a. normal distribution b. t-distribution with n₁ + n₂ degrees of freedom c. t-distribution with n₁ + n₂-1 degrees of freedom d. t-distribution with n₁ + n₂ + 2 degrees of freedom

The sampling distribution of the difference of two sample proportions is approximated by a a. normal distribution b. t-distribution with n₁ + n₂ degrees of freedom c. t-distribution with n₁ + n₂-1 degrees of freedom d. t-distribution with n₁ + n₂ + 2 degrees of freedom

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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The overhead reach distances of adult females are normally distributed with a mean of 197.5 cm and a standard deviation of 8.3 cm. a. Find the probability that an individual distance is greater than 210.00 cm. b. Find the probability that the mean for 20 randomly selected distances is greater than 195.70 cm. c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30? Question content area bottom Part 1 a. The probability is enter your response here. (Round to four decimal places as needed.) Part 2 b. The probability is enter your response here. (Round to four decimal places as needed.) Part 3 c. Choose the correct answer below. A. The normal distribution can be used because the original population has a normal distribution. B. The normal distribution can be used because the finite population correction factor is small. C. The normal distribution can be used because the mean is large. D. The…
Describe the sampling distribution of p. Assume the size of the population is 25,000 n = 400, p = 0.4 Choose the phrase that best describes the shape of the sampling distribution of p below. OA. Approximately normal because n ≤0.05N and np(1 - p) < 10 B. Not normal because n ≤0.05N and np(1-p) < 10 OC. Approximately normal because n ≤0.05N and np(1-p) ≥ 10. O D. Not normal because n ≤0.05N and np(1-p) ≥ 10 Determine the mean of the sampling distribution of p HA = (Round to one decimal place as needed.) Determine the standard deviation of the sampling distribution of p (Round to three decimal places as needed) OA = р
Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean μ=156 days and standard deviation σ=12 days. (b) Suppose a random sample of 19 pregnancies is obtained. Describe the sampling distribution of the sample mean length of pregnancies. The sampling distribution of x is skewed right/skewed left /normal with μx = _____ and σx = _____
The overhead reach distances of adult females are normally distributed with a mean of 195 cm and a standard deviation of 8 cm. a. Find the probability that an individual distance is greater than 205.00 cm. b. Find the probability that the mean for 25 randomly selected distances is greater than 193.50 cm. c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30? Question content area bottom Part 1 a. The probability is enter your response here. (Round to four decimal places as needed.) Part 2 b. The probability is enter your response here. (Round to four decimal places as needed.) Part 3 c. Choose the correct answer below.
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How is the t distribution different from the Z distribution? a. The t distribution does not have any negative numbers. b. The t distribution is asymmetrical; that is, it is not a mirror image on each side of the population mean. c. The t distribution is wider than the Z distribution due to lower sample size. d. All of the above are differences between the t and Z distributions
Can a normal approximation be used for a sampling distribution of sample means from a population with u = 55 and o = 10, when n = 4? Answer E Tables E Keypad Keyboard Shortcuts O Yes, because the mean is greater than 30. O Yes, because the sample size is less than 30. O No, because the sample size is less than 30. O No, because the standard deviation is too small.
Distribution of sample means e.
n a trial for the university athletics competition, one aims to estimate the mean chest size of the male athletes. A random sample of 70 male athletes gave rise to an average chest size of 42 inches with a standard deviation of 16 inches. What would be the distribution of the statistic that we need to estimate the mean chest size? a. It is a normal distribution with mean 42 inches and standard deviation 16 inches. b. it is a student's t distribution with degree of freedom 69. c. It is a student's t distribution with mean 42 inches and standard deviation 16 inches. d. it is a normal distribution with degree of freedom 69. 2.What is the standard error of the sample mean in problem 1? a. 1.91 b. 0.23 c. 17.5 d. 16 3. What would be the margin of error for a 95% confidence interval of the true chest size in problem 1? a. 0.46 b. 0.52 c. 3.82 d. 4.38
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