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Briefly define the following statistical terms: i

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Briefly define the following statistical terms: i. Sampling Frame

 

 

ii. Continuous variables

iii. Secondary data

iv. Probability sampling

v. Random sample

 

The number of cars sold by each of the 6 sales people in an automobile dealership during a particular month, are listed as below:

10 12 14 10 10 15

i. Calculate the mean

ii. Calculate the median.

iii. Determine the mode.

iv. Determine the standard deviation 

 

 

i. If you use 0.05 level of significance in a (two-tail) hypothesis test, what will you decide if the computed value of the test statistics Z is +1.21?

 

ii. If you use 0.01 level of significance in a hypothesis test, define your decision rule for rejecting H0: µ =12.5 if the Z statistics is -2.25.

 

iii. Suppose that in a one-tail hypothesis test where you reject H0 only in the lower tail, what is the critical value of the Z test statistics at the 0.01 level of significance?

 

iv. In a sample of 16 selected from a left-skewed population, mean sample is 65 and standard deviation is 21, would you use the t test to test the null hypothesis H0:µ= 60? Discuss.