AP Stats Mid Year

What percentage of SUV's are driven by women?

• 56.25%
• 75%
• 83.25%
• 86.5%

The percentile represents the....

• percent of data values that are below.
• percent of data values that are above.
• number of data values that are below.
• number of data values that are below.

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  What is the z-score for a temperature of 17 degrees?  

• 1 
• 1.43
• -1.43
• 11.5

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?

• 68%
• 34%
• 16%
• 2.5%

All of the below sets have the same mean.
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?

• 1
• 2
• 3
• 4

Use the data to calculate the prediction line and use the equation to predict the number of prom tickets sold on day 6.

• y = 4.54 + 27.31x ; prom tickets are estimated to be about 58.93

• y = 27.31 + 4.54x ; prom tickets are estimated to be about 54.55

• y = .97 + 4.54x ; prom tickets are expected to be about 41.24

Which of these is the best interpretation of the number 0.1297?

• For each additional square foot of area, the price is predicted to increase by about $0.1297
• A house which has 0 square feet is predicted to cost about $0.1297
• For each additional square foot, the price of the house is predicted to increase about $12.97.
• For each additional square foot of area, the price of the house is predicted to increase 129.70.

Which of the following is the regression equation for this data?

• Price^ = 87.3180 - 19.4(Area)
• Price^ = -19.4 + 0.1297(Area)
• Area^ = -19.4 + 0.1297(Price)
• Price^ = 0.1297 - 19.4(Area)

Which of the following is a correct conclusion based on the residual plot displayed?

• the line overestimates the data.

• The line underestimates the data.

• It is not appropriate to fit a line to these data since there is clearly no correlation.

• The data are not related.

• There is a nonlinear relationship between the variables.

The most important advantage of experiments over observational studies is that

• A) experiments are usually easier to carry out
• B)Experiments can usually give better evidence of causation
• C) Confounding cannot happen in experiments
• D) Observational studies cannot use random samples