Sampling errors tend to be larger with Question 7 options la

Sampling errors tend to be larger with:

Question 7 options:

larger samples

smaller samples

unbiased samples

A calculated Wilcoxon value that is larger than the tabled value

Question 9 options:

Is evidence of an arithmetic mistake

Leads to acceptance of the alternative hypothesis

Leads to retention of the null hypothesis

Leads to rejection of the null hypothesis

If a psychology exam is normally distributed, with a mean of 75 and a standard deviation of 5, what is the probability of someone scoring 80 or higher on the exam?

Question 16 options:

> 34%

p < .05

< 16%

95%

Solution

Normal Distribution
Mean ( u ) =75
Standard Deviation ( sd )=5
Normal Distribution = Z= X- u / sd ~ N(0,1)                  
P(X < 80) = (80-75)/5
= 5/5= 1
= P ( Z <1) From Standard Normal Table
= 0.8413                  
P(X > = 80) = (1 - P(X < 80)
= 1 - 0.8413 = 0.1587 ~ 16%   

someone scoring 80 or higher on the exam < 16%

Noted: Post the other in next thread