A population has a mean of 1398.25and standard deviation of246.85 16If we kept n at 82 but reduced the error probability to α = 0.01, the magin of error would ...aDecrease by20%bIncrease by20%cIncrease by31%dIncrease by24%

The correct option is C which is the margin of error increase by 31% the solution given in the image…

Answered: A population has a mean of 1398.25 and…

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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From generation to generation, the mean age when smokers first start to smoke varies. However, the standard deviation of that age remains constant at around 2.1 years. A survey of 41 smokers of this generation was done to see if the mean starting age is at least 19. The sample mean was 18.2 with a sample standard deviation of 1.3. Do the data support the claim at the 5% level? Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part 1) Sketch a picture of this situation. Label and scale the horizontal axis and shade the region(s) corresponding to the p-value Part 2) Alpha (Enter an exact number as an integer, fraction, or decimal.)α = Part 3) Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence interval. (Round your lower and upper…
From generation to generation, the mean age when smokers first start to smoke varies. However, the standard deviation of that age remains constant at around 2.1 years. A survey of 42 smokers of this generation was done to see if the mean starting age is at least 19. The sample mean was 18.1 with a sample standard deviation of 1.3. Do the data support the claim at the 5% level?Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) State the distribution to use for the test. (Round your answers to four decimal places.) X ~ , What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) = What is the p-value? (Round your answer to four decimal places.)
Let X de a normally distributed variable with a population standard deviation = 43. A research believe that the standard deviation should increase when a new variable is manipulated. To test their claim, the research collects a sample of size n = 19 and finds a sample statistic of 8 = 53. Use the x²-table to find the largest value that the corresponding P-value can be. Type your answer...
The contents of 3232 cans of Coke have a mean of ?⎯⎯⎯=12.15x¯=12.15 and a standard deviation of ?=0.12.s=0.12. Find the value of the test statistic ?t for the claim that the population mean is ?=12.μ=12.
In a normal distribution, x = 5 and z = –1.4. This tells you that x = 5 is ____ standard deviations to the ____ (right orleft) of the mean.
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Suppose the scores on an exam have a mean of 70 with a standard deviation of 10. If one student hasa test result with a z-score of -0.8 and a second student has a test result with a Z-score of 1.8, how many points higher was the second student's score than that of the first? O a. 10 O b. 20 O c. 2.6 O d. 13 O e. 26
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a	Decrease by	20%
b	Increase by	20%
c	Increase by	31%
d	Increase by	24%

A population has a mean of 1398.25 and standard deviation of 246.85 16 If we kept n at 82 but reduced the error probability to α = 0.01, the magin of error would ... a Decrease by 20% b Increase by 20% c Increase by 31% d Increase by 24%