7. From a population that is not normally distributed and whose standard deviation is not known, a sample of 50 items is selected to develop an interval estimate for μ. Which of the following statements is true?- ○ The standard normal distribution can be used.- ○ The sample size must be increased in order to develop an interval estimate.- ○ The t distribution with 50 degrees of freedom must be used.- ○ The t distribution with 49 degrees of freedom must be used.

Formula : Degree of freedom : df = n-1

Answered: 7. From a population that is not…

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 200 cm and a standard deviation of 8 cm. Find the probability that an individual distance is greater than 210.00 cm. Find the probability that the mean for 20 randomly selected distances is greater than 198.50 cm. c. Why can the normal distribution be used in part (b), even though the sample size does not
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For most distributions, we can use the normal distribution to make a confidence interval for a population mean provided that the population standard deviation o is known and the sample size is: O greater than 30. O less than 25. greater than 100. O greater than or equal to 30.

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