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33 Cards in this Set
- Front
- Back
- 3rd side (hint)
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In 50 patients given a vaccine, 8 patients had a negative reaction. Find the probability a patient did not have a negative reaction.
A. 0.08 B. 0.16 C. 0.84 D. 0.92 |
C.
0.84 |
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A test consists of 5 true-false questions. How many different possible answer sequences are there?
A. 5 B. 10 C. 20 D. 32 |
B.
10 |
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Which of the following values indicates the least linear correlation?
A. -1.0 B. -0.5 C. 0.0 D. 1.0 |
B.
-0.5 |
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A carton holds 18 eggs. If only 3 eggs are fertile, what is the probability of randomly selecting 2 eggs that are fertile if the selected eggs are not replaced?
A. 3/28 B. 9/64 C. 1/4 D. 3/4 |
C.
1/4 |
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If 12 jurors are to be selected from 14 possible candidates, how many different groups of jurors can be selected?
A. 12 B. 14 C. 91 D. 182 |
C.
91 |
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Scores of a test are normally distributed with a mean of 80 and a standard deviation of 5. If a sample of 25 is randomly selected, find the probability the sample mean will be between 80 and 85.
A. .34 B. .475 C. .500 D. .68 |
D.
.68 |
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The scatterplot below would be best fitted by which of the following linear equations?
A. y = -1.2x + 5 B. y = -1.2x - 5 C. y = 1.2x + 5 D. y = 1.2x - 5 |
D.
y = 1.2x - 5 |
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Find the correlation coefficient which would best describe the data in the scatterplot below:
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A.
-1 |
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If large samples of size n are selected from a population that is uniformly distributed with mean, µ, and standard deviation, s what will be the distribution of the sample means?
A. A uniform distribution B. A binomial distribution C. A chi-square distribution D. A normal distribution |
A.
A uniform distribution |
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If P(A or B )= .4, P(A) = .2, and P(A and B) = .1, find P(B).
A. .1 B. .2 C. .3 D. .5 |
C.
.3 |
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Given r = 0.05 for a collection of paired data whose regression line is y’ = 5.0x + 7.2, what is the best point estimate of y?
A. The result of substituting a given value of x into the regression equation B. x C. y D. The y-intercept |
D.
The y-intercept |
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If the mean and median are equivalent for a given set of 10 scores, we know the distribution of the scores is
A. skewed to the left. B. symmetric. C. skewed to the right. D. unable to be determined. |
B.
symmetric. |
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If P(A) = .40, P(B) = .90, and P(A and B) = .36, we can conclude the events A and B are
A. mutually exclusive. B. dependent. C. independent. D. Conditional. |
D.
Conditional. |
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Suppose a couple plans on having 3 children. The probability of having a boy is 1/2, and the sex of one child is independent of the other. Find the probability the couple will have at least 1 girl.
A. 0.125 B. 0.25 C. 0.50 D. 0.875 |
B.
0.25 |
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If a conclusion is based on the p-value alone when testing a hypothesis and the p-value is less than 0.01, we know
A. there is insufficient evidence against the null hypothesis. B. it is not statistically significant. C. there is very strong evidence against the alternative hypothesis. D. it is statistically significant. |
B.
it is not statistically significant. |
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A set of scores has a mean of 60 and a standard deviation of 25. What is the standardized score corresponding to the score 85?
A. -2 B. -1 C. 1 D. 2 |
D.
2 |
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Assuming the population is normally distributed and we are testing the claim that a population has a standard deviation of 50.0, what is the test statistic if a random sample of 18 gives a standard deviation of 60?
A. c²=24.5 B. F C. c²=1.4 D. F = 24.5 |
C.
c²=1.4 |
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If 366 different possible dates are written on separate pieces of paper and mixed in a bowl, find the probability of selecting a piece of paper that has the first day of a month or a December date.
A. 12/366 B. 31/366 C. 42/366 D. 43/366 |
B.
31/366 |
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The probability a computer chip is defective is 0.20. Find the probability of getting exactly 2 defective chips in a sample of 5.
A. .05 B. .16 C. .21 D. .50 |
B.
.16 |
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A large, normally distributed population has a mean of 100 and a standard deviation of 5. If a sample of 25 is randomly selected, find the probability the sample mean will be between 100 and 105.
A. .34 B. .475 C. .500 D. .68 |
C.
.500 |
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Assume the number of hours high school students spend studying each week is normally distributed with a mean of 6 and a standard deviation of 2. In order for only 2.5% of this group to study more, how many hours must a student study?
A. 4 B. 2 C. 10 D. 8 |
D.
8 |
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The equation of a regression line is y = -.75x +.95 with r = -0.99. At what estimated value will the regression line pass through the y-axis?
A. -0.75 B. -0.95 C. -0.99 D. 0.95 |
C.
-0.99 |
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Suppose we take samples of size n from a population of which random variable x has some distribution with mean, µ, and standard deviation, s We may conclude which of the following statements?
A. The distribution of all possible sample means will approach a normal distribution. B. The mean of the sample means is µ. C. The standard deviation of the sample means is D. All of the above are correct. |
D.
All of the above are correct. |
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Which of the following is not a condition that should be met when testing a claim concerning a population mean and the Student t distribution is used?
A. The degrees of freedom (df) is greater than 100. B. The sample is small (n £ 30). C. s is unknown. D. The sample comes from a population having roughly the shape of a normal distribution. |
D.
The sample comes from a population having roughly the shape of a normal distribution. |
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Sally keeps her savings in a piggy bank. She began with $100 and adds $75 each year. Her total savings after x years is given by y = 100+75x. After 12 years, how much money will Sally have?
A. $500 B. $750 C. $1000 D. $1100 |
C.
$1000 |
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A set of 10 points lies exactly on the regression line, y = 0.5x - 2. What is the correlation between x and y?
A. -2 B. -1 C. 0.5 D. 1 |
D.
1 |
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A large, normally distributed population has a mean of 100 and a standard deviation of 20. If a sample of 25 is randomly selected, find the standard error of the mean.
A. 0.80 B. 4.0 C. 20.0 D. 25.0 |
C.
20.0 |
The standard error of a sample mean is equal to its standard deviation.
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The scores of an entrance exam have a normal distribution with a mean of 18.4 and a standard deviation of 6. What is the probability the mean score for 100 students randomly selected is 17.8 or higher?
A. .46 B. .34 C. .68 D. .84 |
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Find the median of the following score: 1, 2, 5, 7, 7, 9, 9, 9, 9, 12
A. 7 B. 8 C. 9 D. 11 |
B.
8 |
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If a constant k (k>0) is added to each value in a set of scores, which of the following is not true?
A. The mean is increased by k. B. The median is increased by k. C. The standard deviation is increased by k. D. The mode is increased by k. |
C.
The standard deviation is increased by k. |
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If events A and B cannot occur simultaneously, the two events are
A. mutually exclusive. B. a compound event. C. independent. D. dependent. |
A.
mutually exclusive. |
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We want to be 99.7% confident that a random sample yields a mean that is within 2.0 of the true mean. If s is 9, how large should our sample be?
A. 98 B. 182 C. 183 D. 729 |
C.
183 |
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Test the claim that a population mean exceeds 0.40. A sample of 50 items has a sample mean of 44. If s = 8, test the claim at a significance level of a = 0.05.
A. Reject the claim µ > 40. B. Reject the claim µ < 40. C. Reject the claim µ £ 40. D. Fail to reject the claim µ £ 40. |
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