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• From Mathematics: Statistics
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• Due on Sep. 10, 2009
• Asked on Sep 07, 2009 at 11:58:05PM

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Q:

Statistic help please. Show all work incuding factor sets.

1.  A random sample of 46 observations was selected from a normally distributed population. The sample mean was = 81, and the sample variance was s2 = 35.0. Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 7 at the 0.05 level of significance? Use the p-value method

2.          A teacher wishes to compare two different groups of students with respect to their mean time to complete a standardized test. The time required is determined for each group. The data summary is given below. Test the claim at a= 0.05, that there is no difference in variance. Give the critical region, test statistic value, and conclusion for the F test.

n1=60, s1=24

n2=120, s2=28

a= 0.05

3.       The pulse rates below were recorded over a 30-second time period, both before and after a physical fitness regimen. The data is shown below for 10 randomly selected participants. Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume pulse rates are normally distributed. Test using a = 0.05.

 Before 31 25 30 31 33 25 32 45 After 32 29 30 37 40 35 34 52
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4. You are given the following data. Test the claim that there is a difference in the means of the two groups. Use a = 0.05.

group A: xbar1=3; s1=0.5; n1=100

group B: xbar2=4; s2=0.3; n2=40

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