3. A sample of 20 items from a population with an unknown o is selected in order to develop an intervalestimate of u. Which of the following is not necessary?A. We must assume the population has a normal distribution.B. We must use t distribution.C. Sample standard deviation must be used to estimate the population standard deviation.D The sample must have a normal distribution.

Answer : C). Sample standard deviation must be used to estimate the population deviation

Answered: 3. A sample of 20 items from a…

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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9. Write the appropriate notation symbol that corresponds to the given parameter or statistic. a. Population Mean: tof births d. Population Standard Deviation: variable? Triplets b. Sample Mean: e. Sample Variance: c. Population Variance: f. Sample Standard Deviation: sihle for the standard deviation of a list of numbers to equal zero?
I need help with #15
The finite population correction is most useful for which of the following? a. It adjusts the estimated mean when the sample size is a large fraction of the population size. b. It adjusts the standard error of the mean when the sample size is a small fraction of the population size. c. It adjusts the estimated mean when the sample size is a small fraction of the population size. d. It adjusts the standard error of the mean when the sample size is a large fraction of the population size.
The population mean mu is a measure of A. Central tendency of a sample B. Central tendency of a populationC. Dispersion of a population D. The uncertainty of a population E. None of the above
D, E, F only
2)
B Choosing a topic Sk.. For data that is not normally distributed we can't use z-scores. However, there is an equation that works on any distribution. It's called Chebyshev's formula. The formula 1 where p is the minimum percentage of scores that fall within k k2 is p = 1 - standard deviations on both sides of the mean. Use this formula to answer the following questions. a) If you have scores and you don't know if they are normally distributed, find the minimum percentage of scores that fall within 2.2 standard deviations on both sides of the mean? b) If you have scores that are normally distributed, find the percentage of scores that fall within 2.2 standard deviations on both sides of the mean? c) If you have scores and you don't know if they are normally distributed, how many standard deviations on both sides of the mean do we need to go to have 64 percent of the scores? Note: To answer part c you will need to solve the equation for k.
Assume that a randomly selected subject is given a bone density test. Bone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find Upper P 10 ,the 10 th percentile. This is the bone density score separating the bottom 10% from the top 90%. a. The bone density score corresponding to Upper P 10 is (Round to two decimal places as needed.)
Q) Fit the curve of the form y = ab* to the following data, then find the standard deviation. 3 4 5 7 1.8 2.5 3.6 4.7 6.6
Test the claim below about the mean of the differences for a population of paired data at the level of significance a. Assume the samples are random and dependent, and the populations are normally distributed. Claim: H. = 0; a 0.05. Sample statistics: d = 3.2, s, =8.49, n=9 Identify the null and alternative hypotheses. Choose the correct answer below. O B. Ho: Ha 0 H: Hg =0 O A. Ho: Ha s0 H: Hg>0 O D. Ho: Ha>0 H: Hg sO OC. H,: Ha <0 Ha: Ha 20 O E. H, Ha 20 F. Ho: Ha=0 Ha: H #0 The test statistic is t= (Round to two decimal places as needed.)
Assume a population of 3, 4, and 11. Assume that samples of size n = 2 are randomly selected with replacement from the population. Listed below are the nine different samples. Complete parts a through d below. 3,4 3,3 a. Find the value of the population standard deviation o. S ▼ 3,11 ▼ ■ 1 | 4,3 4,4 C (Round to three decimal places as needed.) b. Find the standard deviation of each of the nine samples, then summarize the sampling distribution of the standard deviations in the format of a table representing the probability distribution of the distinct standard deviation values. Use ascending order of the sample standard deviations. Probability (Type integers or fractions.) c. Find the mean of the sampling distribution of the sample standard deviations. The mean of the sampling distribution of the sample standard deviations is. 4,11 11,3 11,4 11,11
Use the information provided to find the minimum sample size required to estimate an unknown parameter Mean(u). How many students should be randomly selected to estimate the average weekly earnings of students at a university? We want 80% confidence that the sample mean is within $ 3 of the population mean and the population standard deviation is known to be $ 57. Select one: a. 978 b. 362 c. 1388 d. 594 e. 2397

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