Chapter 1 Test Probability and Statistics

Probability is used as a basis for Inferential Statistics

• True

• False

Select the best answer: Every 100th hamburger manufactured is checked to determine its fat content.

• random

• systematic

• stratified

• cluster

Identify the given random variable as being discrete or continuous. The number of students earning an A is Statistics this fall.

• discrete

• continuous

Determine if the following is a probability distribution. If not, identify the requirement that is not satisfied. A administration reports the probabilities that 0,1,2, and 3 fights occur in a single week at a school are 0.766, 0.204, 0.030, 0.0002, respectively.

• Yes

• No; the sum of probabilities is not 1

• No; all probabilities must be positive

Focus groups of 12 people are randomly selected to discuss Tik Tok. It is determined that the mean number (per group) who recognize the Tik Tok platform is 10.2, and the standard deviation is 1.1. Would it be unusual to randomly select 12 people and find that all 12 recognize the Tik Tok platform?***Extra Credit if you post a home made Tik Tok that is Statistics related by the due date of this test. This can be done with a partner.

• Yes, some older people don't know what Tik-Tok is

• No; the upper limit for usual values in this case would 12.4

• Yes; the upper limit for usual values in this case would be 11.3

• No; Tik Tok is legit!

Assume that a researcher randomly selects 14 newborn babies and counts the number of girls selected. Find the probability of selecting exactly 10 girls.

• 6.1%

• 61%

• 50%

• 10%

Determine whether the given procedure results in a binomial distribution. If not, state why. Choosing 5 people (without replacement) from a group of 400 people, of which 150 are women, keeping track of the number of men chosen.

• No; trials are not independent

• No; need to keep track of number of women instead

• Yes; 5 is less than 5% of sample so dependent trials can be treated as independent.

Caribou Coffee has a 73% recognition rate. If a random sample of 10 people are selected, find the probability that the number of people who recognize the brand is NOT 8.

• 26.5%

• 73.5%

• 92%

• 8%

Ryley makes a her free throws 87% of the time. If she shoots 9 free throws, what is the probability that she makes exactly 8 of them?

• 87%

• 38.4%

• 61.6%

The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 510 jawbreakers that weigh more than .4 ounces?

• Yes; 510 is over 507.8, which the maximum usual value

• Yes; 510 is over 493.9, which the maximum usual value

• No; some jawbreakers are bigger than others