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- Multiple ChoicePlease save your changes before editing any questions.This is an example of afrequency tabledot plotbox-and-whiskerhistogram
- Multiple ChoicePlease save your changes before editing any questions.Is the data skewed right, left, or symmetrical?rightleftsymmetrical
- Multiple ChoicePlease save your changes before editing any questions.What is the IQR of this data set?
37 42 48 51 52 53 54 54 555689 - Multiple ChoicePlease save your changes before editing any questions.What percent does each of the 4 sections contain on a box and whisker plot?100%75%50%25%
- Multiple ChoicePlease save your changes before editing any questions.Which of the following is an example of categorical data?High School Graduate or NotAnnual IncomeYears of Schooling CompletedYears of playing an instrument
- Multiple ChoicePlease save your changes before editing any questions.
Find the Z-score.
Mean = 22
Standard Deviation: 3.1
x = 29
2.26
16.45
-2.26
1.26
- Multiple ChoicePlease save your changes before editing any questions.
Find the mean.
Z-score = -1.4
Standard Deviation: 7
x = 20
29.8
10.2
-21
35
- Multiple ChoicePlease save your changes before editing any questions.Describe the correlation in the graph shown.Strong NegativeStrong PositiveWeak NegativeWeak Positive
- Multiple ChoicePlease save your changes before editing any questions.What letter do we use to represent correlation coefficient?crph
- Multiple ChoicePlease save your changes before editing any questions.
Is r = -0.87 strong, moderate, or weak?
strong
moderate
weak
- Multiple ChoicePlease save your changes before editing any questions.Estimate the value of r:0.03-0.990.79-0.72
- Multiple ChoicePlease save your changes before editing any questions.How do you calculate a residual?Observed - PredictedPredicted - Observed
- Multiple ChoicePlease save your changes before editing any questions.What type of correlation exists between the temperature outside and the number of hot chocolate sold at a football game.positivenegativeno correlationunknown
- Multiple ChoicePlease save your changes before editing any questions.Kim surveys 100 moviegoers that entered the movie theater in the first hour. What type of sampling method is this?RandomConvenienceBiased
- Multiple ChoicePlease save your changes before editing any questions.
A large company wants to conduct a survey to determine the proportion of its male employees who practice yoga on a daily basis. Two of its regional offices are chosen at random and all of the male employees at each office are surveyed. The plan is an example of which type of sampling?
Cluster
Convenience
Simple random
Stratified random
Systematic
- Multiple ChoicePlease save your changes before editing any questions.
Joe Mama wants to do an observational study comparing height and weight. He also does a study comparing weight and calories consumed daily. He concludes that the more calories you consume, the more you weigh. And people who weigh more are generally taller. Therefore, if you eat more, you will get taller. Why is this incorrect?
Causation from one observational study cannot be extrapolated and applied to another
Correlation does not indicate causation
He is ignoring the lurking variable of age
He did not have a control group
- Multiple ChoicePlease save your changes before editing any questions.Every possible group of units of the required size has the same chance of being the selected sample as any other sample of the same size.Simple RandomThoughtfulTypicalProportional
- Multiple ChoicePlease save your changes before editing any questions.This sample is selected by dividing the population into subgroups and then taking a fixed number of units from each group using the simple random sample.stratifiedclusterjudgmentexperimental
- Multiple ChoicePlease save your changes before editing any questions.A company states that 2% of its computers are returned for defects. We take a sample of 100 computers to find the probability of 10 being defective. Is this a binomial distribution?No because there is not a fixed number of trials.No because their are more than 2 outcomes.Yes since there are a fixed number of independent trials, outcomes in 2 categories, and the probability of defect is constant.No since computers would not be independent.
- Multiple ChoicePlease save your changes before editing any questions.On an eight question multiple choice quiz with 4 answers for each question, what is the probability of guessing and getting 6 correct answers?.004.109.003.9996
- Multiple ChoicePlease save your changes before editing any questions.P(Sandals):16/2220/365/920/16
- Multiple ChoicePlease save your changes before editing any questions.Find the area under the standard normal curve where z < 2.42 ..008.992.301.862
- Multiple ChoicePlease save your changes before editing any questions.In the formula shown, what is in the denominator?Sample MeanIndividual ScoreSample VarianceSample Standard Deviation
- Multiple ChoicePlease save your changes before editing any questions.What is the probability that a family doesn't have a baby girl until their third child?0.130.150.050.88
- Multiple ChoicePlease save your changes before editing any questions.The probability that Jalen makes a free throw is 75%. What is the probability he makes his first free throw on his third attempt?geometcdf(3, 0.75)geometpdf(0.75, 3)geometpdf(3, 0.75)geometcdf(0.75, 3)
- Multiple ChoicePlease save your changes before editing any questions.Given the probability model in the table below, what is the expected value of the random variable?
X 50 20 5
P(X) 0.1 0.3 0.6144.6757.5 - Multiple ChoicePlease save your changes before editing any questions.A coin is flipped 3 times. If you get tails once you get $5, tails twice you get $15, and tails on all three flips you get $40. What is the expected amount of money you will get?$12.50$5$7.50$10
- Multiple ChoicePlease save your changes before editing any questions.
The Gallup Poll asked a random sample of 1785 adults whether they attended church during the past week. Let p-hat be the proportion of people in the sample who attended church. A newspaper report claims that 40% of all U.S. adults went to church last week. Suppose this claim is true.
What is the mean of the sampling distribution of p-hat?
0.40
0.44
0.56
0.60
- Multiple ChoicePlease save your changes before editing any questions.What happens to the shape of a sampling distribution of sample means as n increases?It becomes narrower and bimodal.It becomes narrower and more normal.It becomes wider and skewed right.It becomes wider and more normal.
- Multiple ChoicePlease save your changes before editing any questions.These symbols represent the mean and standard deviation for which of the following distributions?The PopulationThe SampleThe Sampling Distribution
- Multiple ChoicePlease save your changes before editing any questions.These symbols represent the mean and standard deviation for which of the following distributions?The PopulationThe SampleThe Sampling Distribution
- Multiple ChoicePlease save your changes before editing any questions.These symbols represent the mean and standard deviation for which of the following distributions?The PopulationThe SampleThe Sampling Distribution
- Multiple ChoicePlease save your changes before editing any questions.
A random sample of 49 medical doctors in LA showed that they worked an average of 53.1 hours/week with a standard deviation of 7.2 hours/week. If the California average is 60 hours/week, does this give evidence that the LA doctors work significantly less than the rest of California? What test should be used?
One-Sample T Test for a Mean
One-Sample Z Test for a Mean
One-Sample T Test for a Proportion
One-Sample Z Test for a Proportion
- Multiple ChoicePlease save your changes before editing any questions.
USA Today reported that in 1992, 39% of all elementary school children claimed that when they grow up they want to do something to help other people. However, in 1995, 128 of a random sample of 317 of these same children claimed that when they grow up they want to do something to help other people. Does this information indicate that there has been an attitude change either way? What test should be used?
One-Sample Z Test for a Proportion
Two-Sample Z Test for the Difference in Proportions
One-Sample T Test for a Mean
Two-Sample T Test for the Difference in Means
- Multiple ChoicePlease save your changes before editing any questions.
The manager of a sporting goods store offered a bonus commission to his salespeople when they sold moregoods. A new manager dropped the bonus system. For a random sample of six sales people, the weeklysales (in thousands of dollars) are shown in the following table with and without the bonus system
Salesperson 1 2 3 4 5 6
with bonus 2.9 3.0 5.8 4.4 5.3 5.6
w/o bonus 2.8 2.5 5.9 3.5 4.6 4.6
difference 0.1 0.5 -0.1 0.9 0.7 1.0
What test should be used?
Matched-Pairs T Test for a Mean
One-Sample T Test for a Mean
Two-Sample T Test for the Difference in Means
- Multiple ChoicePlease save your changes before editing any questions.
Dannon is supposed to put 29.6 grams of fruit in their fruit-flavored yogurt. To see if enough fruit is being placed in cups of fruit-flavored yogurt, a quality inspector measured the amount in 27 containers.She found an average of 28.9 grams of fruit and standard deviation of 2.8 grams. Does this show that there is probably enough yogurt in the cups? What test should be used?
One-Sample T Test for a Mean
One-Sample Z Test for a Proportion
Matched-Pairs T Test for a Mean
Chi-Square Goodness of Fit Test
- Multiple ChoicePlease save your changes before editing any questions.Margin of error equals:Critical Value ∗ standard Errorz*1.96Standard Error
- Multiple ChoicePlease save your changes before editing any questions.What does it mean when a test is statistically significant?it has reached alpha level statusthe test statistic had a P-value higher than the alpha levelthe test statistic had a P-value lower than the alpha levelit is important in practical terms
- Multiple ChoicePlease save your changes before editing any questions.How can you reduce both Type I and Type II errors?it can't be reducedredo the testsincrease the sample sizetamper with the data
- Open EndedPlease save your changes before editing any questions.
Which episode of Star Wars is the best? (Choices are 1 through 9).