Question 1

A team of scientists wants to understand the relationship between smoking and lung cancer. They collect datafrom 1,000 individuals, recording their smoking habits and whether they have been diagnosed with lungcancer. The scientists then analyze the data to find any correlations.Is this study observational or experimental?

Options :

A : Experimental, because the researchers are analyzing the data to find correlations.

B : Experimental, because the researchers are testing the effects of smoking on lung cancer.

C : Observational, because the study involves a large sample size.

D : Observational, because the researchers are collecting data without manipulating any variables.

Answer: D

Question 2

Sample mean = 40, SD = 8, n = 16. Standard error = ?

Options :

A : 2

B : 8

C : 0.5

D : 4

Answer: A

Question 3

Uniform distribution 0–10: P(X < 4) = ?

Options :

A : 0.4

B : 0.6

C : 0.5

D : 0.25

Answer: A

Question 4

A golf course is attempting to correlate golfing handicap with math SAT scores among local high school golfers. Ignoring potential confounding variables such as socioeconomic status, the golf course creates the following scatterplot.What is the estimated value of r, the correlation coefficient, between these variables?

Options :

A : #0.63

B : #0.10

C : 0.10

D : 0.63

Answer: B

Question 5

Variance formula = ?

Options :

A : #(x# # x#)² / (n # 1)

B : #x# / n

C : x#²

D : ##(x# # x#)²

Answer: A

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