Statistics Trivia

The number of points scored in an NBA season for a team has the following statistics: Games played is 82, mean = 99.6, mode = 104, and median = 102. How would you describe a graph of this data?

• Left skewed

• Right skewed

• Normal

We always test a null hypothesis against an alternative

• true

• false

What hyphotesis states equality or no difference, or no relationship/effect?

• Statistical hyphotesis

• Alternative hyphothesis

• Null hyphotesis

Which of the following is not one of the steps for hyphotesis testing?

• Calculating the test statistics with the summary sample statistics

• Choosing a cutoff value from your population to determine how close sample is to the population value

• Drawing a conclusion based on the results of your test

• Deciding whether to reject or fail to reject the null hyphotesis

If our sample value is close to the null/population value, we conclude that

• something happened in the study, but the effect is very small

• we can neither accept or reject the null

• something happened in the study; there is a significant effect

• nothing happened in the study; there is no effect

A level of significance of 5% means

• there’s a 5% chance we’re wrong

• there’s a 5% a chance we’ll be wrong if we reject the null hyphotesis

• there’s a 5% a chance we’ll be wrong if we fail to reject the null hyphotesis

• there’s a 5% a chance you’ll get an A on the test

Identify the corerct null hyphotesis

Is the proportion of babies born male different from 50%? In a sample of 200 babies, 96 were male. Test the claim using a level of a level of significance of 1 %

• Ho: p = 0,50

• Ho: p = 0,48

• Ho: µ = 100

• Ho: µ = 96

We conclude “fail to reject Ho”, what could we use as our interpretation

Is the proportion of babies born male different from 50%? In a sample of 200 babies, 96 were male. Test the claim using a level of a level of significance of 1 %

• The proportion of babies born male is not 0,50

• There is not enough evidence to say that the proportion of babies born male is 0,50

• There is not enough evidence to say that the proportion of babies born male is different from 0,50

What does it mean to say a test is two-tailed?

• There is no predicted direction for the alternative hyphotesis

• There are two types of error

• There are two alternative hyphotesis

A car manufacturer advertises that its new subcompact models get 47 mpg. If µ is the mileage of these cars, what could be the null and alternate hyphotesis if we wanted to check if the car’s mpg is overrated?

• Ho: µ = 47 Ha: µ = 47

• Ho: µ = 47 Ha: µ < 47

• Ho: µ = 47 Ha: µ > 47

• Ho: µ = 47 Ha: µ ≠ 47