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Quiz 1: Basic Ideas32 Questions

Quiz 2: Graphical Summaries of Data34 Questions

Quiz 3: Numerical Summaries of Data62 Questions

Quiz 4: Probability30 Questions

Quiz 5: Discrete Probability Distributions83 Questions

Quiz 6: The Normal Distribution52 Questions

Quiz 7: Confidence Intervals65 Questions

Quiz 8: Hypothesis Testing46 Questions

Quiz 9: Inferences on Two Samples86 Questions

Quiz 10: Tests With Qualitative Data33 Questions

Quiz 11: Correlation and Regression39 Questions

Quiz 12: Appendix140 Questions

All types

Questions Type

Compute the standard deviation of the random variable with the given discrete probability distribution
x P(x) 0 0.2 10 0.25 15 0.1 20 0.45

(Multiple Choice)

Answer:

D

The following table presents the probability distribution of the number of vacations X taken last year for a randomly chosen family. Find the probability that a family took at least 3 vacations last year.
x 0 1 2 3 4 P(x) 0.07 0.74 0.1 0.05 0.04

(Multiple Choice)

Answer:

D

An investor is considering a $20,000 investment in a start-up company. She estimates that she has probability 0.1 of a $15,000 loss, probability 0.05 of a $20,000 profit, probability 0.25 of a $35,000 profit, and probability 0.6 of breaking even (a profit of $0). What is the expected value of the profit?

(Multiple Choice)

Answer:

C

Determine whether the table represents a discrete probability distribution.
x P(x) -4 0.3 -3 0.15 -2 0.1 -1 0.5

(True False)

Determine whether the table represents a discrete probability distribution.
x P(x) 5 0.5 6 0.4 7 0.45 8 -0.35

(True False)

Determine the indicated probability for a binomial experiment with the given number of trials n and the given success probability p.
$n = 12 , p = 0.6 , P ($ Fewer than $4 )$

(Multiple Choice)

An investor is considering a $15,000 investment in a start-up company. She estimates that she has probability 0.15 of a $5000 loss, probability 0.15 of a $10,000 loss, probability 0.15 of a $30,000 profit, and probability 0.55 of breaking even (a profit of $0). What is the expected value of the profit?

(Multiple Choice)

A survey asked 863 people how many times per week they dine out at a restaurant. The results are presented in the following table.
Consider the 863 people to be a population. Let X be the number of times per week a person dines out for a person sampled at random from this population. Find the probability that a person dines out 4 or more times per week.

(Multiple Choice)

Compute the mean of the random variable with the given discrete probability distribution.
x P(x) 0 0.2 10 0.2 25 0.4 30 0.2

(Multiple Choice)

Determine whether the random variable described is discrete or continuous. The length in seconds of a randomly-selected TV commercial

(Multiple Choice)

Determine the indicated probability for a binomial experiment with the given number of trials n and the given success probability p
$n = 15 , p = 0.4 , P ( 12 )$

(Multiple Choice)

The following table presents the probability distribution of the number of vacations X taken last year for a randomly chosen family. Find P(1 or more)
x 0 1 2 3 4 P(x) 0.15 0.56 0.15 0.1 0.04

(Multiple Choice)

Determine whether the random variable described is discrete or continuous. The number of minutes you must wait in line at the grocery store

(Multiple Choice)

A survey asked 849 people how many times per week they dine out at a restaurant. The results are presented in the following table.
Consider the 849 people to be a population. Let X be the number of times per week a person dines out for a person sampled at random from this population.Compute the $\operatorname { mean } \mu _ { x ^ { * } }$

(Multiple Choice)

A survey asked 915 people how many times per week they dine out at a restaurant. The results are presented in the following table.
Consider the 915 people to be a population. Let X be the number of times per week a person dines out for a person sampled at random from this population.
Standard deviation $\sigma _ { x ^ { * } }$

(Multiple Choice)

A survey asked 876 people how many times per week they dine out at a restaurant. The results are presented in the following table.
Consider the 876 people to be a population. Let X be the number of times per week a person dines out for a person sampled at random from this population. Find the probability that a person does not dine out at all.

(Multiple Choice)

Determine whether the random variable described is discrete or continuous.The number of 3-point shots made in a basketball game

(Multiple Choice)

Fill in the missing value so that the following table represents a probability distribution.
x -2 -1 0 1 P(x) 0.05 0.47 ? 0.32

(Multiple Choice)

Determine whether the table represents a discrete probability distribution.
x P(x) 3 0.3 4 0.05 5 0.45 6 0.2

(True False)

Determine whether the random variable described is discrete or continuous. The total value of a set of coins

(Multiple Choice)

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