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Statistics
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Betty, an employee of a Daycare, read an article in a magazine that said the average 3yr old child is 37in tall.  Betty works with 3yr olds at the daycare, so later that week, she measured the height of each child who had just turned or was about to turn 3. Here are their heights in inches: 41, 40, 36, 42, 39, 38, 33, 44, 39, 41.                            

      a. State the nondirectional hypotheses  
                            

       b. determine the critical t for a= .05

May 25th, 2015

a.A non directional hypothesis is a type of alternative hypothesis used in statistical significance testing. For a research question, two rival hypotheses are formed. The null hypothesis states that there is no difference between the variables being compared or that any difference that does exist can be explained by chance. The alternative hypothesis states that an observed difference is likely to be genuine and not likely to have occurred by chance alone. Sometimes called a two-tailed test, a test of a nondirectional alternative hypothesis does not state the direction of the difference, it indicates only that a difference existaverage =37 tall

b determine  the critical t for a=0.5 

average 37

:41, 40, 36, 42, 39, 38, 33, 44, 39, 41. 

total=352

average=352/10

=35.2

mean difference=37-35.2

=1.8

1.8/0.5

=3.6


May 25th, 2015

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May 25th, 2015
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May 25th, 2015
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