1) Problem #PRAJBKR "PRAJBKR - Question 4" |
A)
The mean score on Mr. Simoneau's test was 78, with an IQR of 20. If he adds 12 points to everyone's score, what's the new mean? © STATS4STEM.ORG |
B)
What is the new IQR? |
2) Problem #PRAJH7M "PRAJH7M - 245933 - Correlation" |
Correlation is resistant or not resistant to a few outlying observations? © STATS4STEM.ORG |
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3) Problem #PRAJ9EQ "PRAJ9EQ - 267295 - Using the compute..." |
A)
Using the computer output below, fill in the value for A. Round answer to the nearest hundredth. © STATS4STEM.ORG |
B)
The p-value that is represented by the red B, shown in the computer output above, is calculated for which hypothesis test? A) B) C) |
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C)
Refer to the computer output above, what is the value of the red B? Round answer to the nearest hundredths. |
4) Problem #PRAJBTZ "PRAJBTZ - 239807 - The probability t..." |
The probability that Jane will get a cheeseburger and French fries is 0.7. The probability that she will get a cheeseburger is 0.95. What is the probability that she will get French fries given that she gets a cheeseburger? Round answer to the nearest hundredth. © STATS4STEM.ORG |
5) Problem #PRAERE9 "PRAERE9 - Variance of two independent R.V.'s" |
A)
If X and Y are independent random variables with variances, VAR(X)=1 and VAR(Y)=2, find the variance of the random variable Z=6X-3Y. © STATS4STEM.ORG |
B)
If X and Y are independent random variables with variances, VAR(X)=1 and VAR(Y)=2, find the variance of the random variable Z=4X+2Y+4 |
6) Problem #PRAJBYZ "PRAJBYZ - 239962 - You play a game w..." |
A)
You play a game where you have to roll a fair six-sided die. If your die lands on a 3 or a 6, you win a prize. What is the probability of winning for the first time on the third try? Round answer to the nearest hundredth. © STATS4STEM.ORG |
B)
What is the probability that it will take more than 7 tosses for someone to win? Round your answer to the nearest hundredths place. |
C)
What is the probability that it will take no more than 8 tosses for someone to win? Round your answer to the nearest hundredths place. |
D)
What is the expected number of tosses needed for someone to win? |
7) Problem #PRAJ7G5 "PRAJ7G5 - 265448 - Confidence intervals - proportions" |
A)
In a small US city, it was believed that 85% of the voting public supported an increase in green space within the city. A survey of 200 random voters from the city was conducted. Of the voters questioned, 154 said they supported an increase in green space. Construct a 90% confidence interval of the proportion of voters who support an increase in green space within the city. What are the conditions that need to be checked before constructing a confidence interval? Check all that apply. © STATS4STEM.ORG |
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B)
To construct a confidence interval for this problem, which is the correct formula to use? A) B) C) D) E) |
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C)
What is the lower limit of your confidence interval? Answer as a decimal, and round answer to the nearest hundredth. |
D)
What is the upper limit of your confidence interval? Answer as a decimal, and round answer to the nearest hundredth. |
E)
True or False: The following sentence would be considered a correct interpretation of the confidence interval: Based on the sample, we are 90 percent confident that the proportion of voters who support an increase in green space within the city is between 0.72 and 0.82. |
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F)
A proper conclusion regarding the belief that 85% of the voting public supported an increase in green space within the city. |
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8) Problem #PRAJGQR "PRAJGQR - Problem #244511" |
A)
In the criminal justice system, one is presumed innocent until proven guilty. What would be the correct Null and Alternative Hypothesis? A. Ho: Individual Is Innocent HA: Individual Is Guilty B. Ho: Individual Is Guilty HA: Individual Is Innocent © STATS4STEM.ORG |
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B)
If an innocent person is convicted of a crime, what type of error is this? |
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C)
If a guilty person is found to be "Not Guilty", what type of error is this?
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9) Problem #PRAJU2Y "PRAJU2Y - 255399 - Eat-A-Donut offer..." |
A)
Eat-A-Donut offers the following donut selection: People pay by the gram. The distribution of individual donut weights (in grams) is found below: Powdered ~ N(25, 1) Boston ~ N(29, 1.3) Almond ~ N(26, 1.1) Jelly ~ N(28, 1.2) Vegan ~ N(26.5, 0.8) Glazed ~ N(24, 0.7) Jimmy is a regular and he always orders 12 Vegan donuts. What is the probability that the average donut weight for his order of 12 is greater than 26.9 grams? Round answer to the nearest hundredth. Link to z-table © STATS4STEM.ORG |
B)
Without doing any calculations, the probability that one randomly chosen vegan donut weighs more than 26.9 grams will be: |
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C)
Calculate the probability that one randomly chosen vegan donut weighs more than 26.9 grams. Round answer to the nearest hundredth. |
D)
A customer is buying a vegan donut for his boss, but his boss told him that the donut must weigh more than 26.9 grams. The customer asks the staff to repeatedly pick a random donut and weigh it until an acceptable donut is found. What is the probability that the fourth donut will be the first acceptable donut? Round answer to the nearest hundredth. |
E)
What is the probability that an order of dozen vegan donuts will have exactly 3 donuts that weigh more than 26.9 grams? Round answer to the nearest hundredth. |
10) Problem #PRAJGU4 "PRAJGU4 - 244646 - Is it possible to..." |
A)
Is it possible to make a Type I Error when HA is true? © STATS4STEM.ORG |
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B)
To make a Type I error, your conclusion must have been to? |
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C)
If HA is true and you fail to reject the null hypothesis, what type of error have you made? |
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