Chapter 5 Test Review

Front

If A and B are independent events, what is P(A ∩ B) if P(A) = 0.374 and P(B) = 0.481?

Back

P(A ∩ B) = P(A) * P(B) = 0.374 * 0.481 = 0.180.

Front

What is a Type I error in hypothesis testing?

Back

A Type I error occurs when the null hypothesis is rejected when it is actually true.

Front

What is the formula to calculate the portion of outcomes represented by a sector in a circle?

Back

Portion = (Central Angle / 360°).

Front

What does it mean if a numerical distribution is skewed to the right?

Back

It means that the tail on the right side of the distribution is longer or fatter than the left side.

Front

What does a relative frequency histogram represent?

Back

It shows the percentage of total data values that fall within each bin.

Front

What is the definition of independent events in probability?

Back

Two events A and B are independent if the occurrence of one does not affect the probability of the other.

Front

How do you calculate the probability of the union of two independent events A and B?

Back

P(A ∪ B) = P(A) + P(B) - P(A ∩ B).

Front

What is the null hypothesis in hypothesis testing?

Back

The null hypothesis is a statement that there is no effect or no difference, and it is what we test against.

Front

What is the significance level in hypothesis testing?

Back

The significance level (alpha) is the probability of making a Type I error, commonly set at 0.05.

Front

What does it mean for a distribution to be roughly symmetrical?

Back

It means that the left and right sides of the distribution are mirror images of each other.