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Study Resources (Statistics)

  6. [Objective:  Distinguish between numerical and categorical variables]  Explain what a numerical variable is and give an example of a numerical variable. 7. [Objective:  Distinguish between numerical and categorical variables]  Explain what a categorical variable is and give an example of a categorical variable. Use the two-way table below to answer questions.
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  11. Calculate the value of the test statistic and state the value of the pvalue? 12. Using a significance level of 5%, state the correct decision regarding the null hypothesis and write a sentence which summarizes the conclusion and addresses the claim. Section 13.3 (Mann-Whitney Test for Two Independent Groups) 13. List at.
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  11. Does the confidence interval provide evidence that the mean cost of flowers for a wedding has increased? a. Yes b. No 12. Choose the statement that is the best interpretation of the confidence interval. a. That probability that the flowers at a wedding will cost more than $698 is greater than 5%. b. In.
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1.Choose the statement that is not true about multiple comparisons and ANOVA. Choose (d) if all the statements are true. a.ANOVA is a method for testing whether there is an association between a categorical variable and a numerical variable. b.When doing multiple comparisons, the response variable is always numerical, but the independent.
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        Number of team members Number of team members Theoretical Quantiles 6. Use the plot(s) above to explain whether the condition for normality of errors is satisfied. 7. Use the plot(s) above to explain whether the condition for constant standard deviation is satisfied. 8. Use the plot(s) above to explain whether the condition for.
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  11.Suppose a random sample of 1,220 U. S. adults were asked about their opinion regarding federal spending on infrastructure (i.e. roads and bridges). Respondents were asked whether federal spending on infrastructure was (a) too low, (b) adequate, or (c) too high. Respondents were classified by income level. If we wanted.
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  16.An eco-friendly home improvement store owner is thinking about carrying some new products and is interested in her customer’s opinions. The shop owner decides to randomly sample 397 customers and ask them whether they have (a) heard about bricks made from recycled materials and (b) whether they have heard of.
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  1.Choose the appropriate test for the following situation:  Suppose that researchers wish to study whether dieting affects alertness levels.  Three popular dieting plans were included in the study. After following the diet for several weeks, participants were given a test that measured response time to a stimulus. 2.Choose the appropriate test.
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  11. [Objective:  Understand calculations involving percentages or rates]  What is the approximate percentage of women who participated in this study? a. 41% b. 63.9% c. 7.8% d. Not enough information available Consider the following table for questions (12) and (13):  The two-way table below shows teenage driver gender and whether or not the respondent had texted.
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  11. [Objective:  Understand calculations involving percentages or rates]  What is the approximate percentage of study participants who are women? a. 61.9% b. 16.7% c. 26.9% d. Not enough information available Consider the following table for questions (12) and (13):  The two-way table below shows the survey results when sixty adults were asked whether they had made.
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  1. Explain some factors that might indicate that nonparametric inference might be necessary. 2. Suppose you are asked to analyze sample data but you do not know the distribution of the population it came from. Explain how a QQ plot can be used to give you information about the population from.
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  11.A television studio did a poll to determine whether women in different age groups watched different amounts of comedy programming.  Check the TI-84 output to see whether the same-variance condition for ANOVA holds.  Show your work.  Is ANOVA appropriate? One-way ANOVA           F=1.739515653   Cat n Mean StDev p=.2092138468   17-24 25 3.42 1.28 Factor   25-32 15 4.50 3.45 df=2 SS=16.3611111 MS=8.18055556 Error df=15 SS=70.5416667 MS=4.70277778 Sxp=2.16858889   33-40           21           2.17         0.75             Use the following information for questions (12) – (14).  A.
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1. Which of the following is an indication that nonparametric inference might be necessary? a.The sample size is too small to assume the CLT holds. b.The distribution of the population is not Normal. c.The data is strongly skewed d.All of the above 2. What is the QQ plot used for? a.It is a tool that displays.
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    1. [Objective:  Understanding variation]  Which of the following measurements is likely to have the most variation? a. The individual weights in ounces of tennis balls in a randomly selected can of tennis balls. b. The volume of individual pop cans measured in fluid ounces from a randomly selected twenty- four pack. c. The individual.
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  11.Asphodelus fistulosus, a noxious weed commonly known as onionweed, is considered an invasive species in New Mexico and can choke out other vegetation.  To detect the presence of onionweed on public land, environmental researchers partition land into one acre parcels then randomly select a sample of parcels to be fully.
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  Use the following information to answer questions (6) and (7).  These two headlines are on the same topic. Headline A:  Researchers find link between childhood viewing of fast food ads and adolescent obesity. Headline B:  Researchers say that watching fast food ads in childhood causes obese adolescents. 6.Was the study referenced most likely.
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  11.In the context of the ANOVA test, which of the following phrases is equivalent to the phrase “variation between groups”? a.Variation due to treatment b.Variation due to factors c.Explained variation d.All of the above 12.A movie studio did a poll to determine whether women in different age groups watched different amounts of horror movies. Check.
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  1.Choose the statement that is not true about multiple comparisons and ANOVA. Choose (d) if all the statements are true. a.ANOVA is a method for testing whether there is an association between a categorical variable and a numerical variable. b.When doing a multiple comparison, the overall significance level will increase meaning it.
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  1. Explain what residuals are. Where do residuals come from? How are residuals calculated? Complete the table below by calculating the residuals for the following small data set. The linear model relating x and y is y = 5−10x . x y Residual 11 -100   5 -51   7 -63   4 -34   2. Explain how a residual plot can be useful in determining.
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  1.Which energy drink is better?  In a study, researchers randomly assigned 50 similar adults to one of three groups. All subjects were allowed to sleep for eight hours followed by staying awake for ten hours. Depending on which group they were assigned to, subjects then drank 12 ounces of strong.
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  6.What is the test statistic used for the ANOVA procedure?   Explain how it is calculated. 7.Suppose a researcher collected data to compare whether cats of different size categories differed in mean number of hours slept per day.  Cats were categorized as small, medium, or large.  The calculated F-statistic was 220.41.  Given.
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1.Which workout recovery drink is better:  water, a fortified sports drink, or chocolate milk?  In a study, researchers randomly assigned 50 similar athletes to one of three groups. All subjects participated in the same workout. Depending on which group they were assigned to, subjects then drank 12 ounces of water,.
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  1. Which of the following is not necessarily an indication that nonparametric inference might be necessary? a.Variables must be matched pairs b.The sample size is too small to assume the CLT holds. c.The distribution of the population is not Normal. d.The data is strongly skewed 2. What is the QQ plot used for? a.It is a.
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  Use the following table to answer questions (1) - (3). The following table summarizes the outcomes of a study that researchers carried out to determine if females expressed a greater fear of public speaking then males. 1.Describe the categorical variables that are summarized in the table. Describe one association that could.
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  11. Does the confidence interval provide evidence that the mean cost of a wedding has decreased? a. Yes b. No 12. Choose the statement that is the best interpretation of the confidence interval. a. In about 95% of all samples of 40 U. S. weddings, the resulting confidence interval will contain the mean cost.
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  6.  Which interval should the manager report to the store owner about the typical amount of money spent during the holiday season?  Explain. 7. Calculate the mean, median, and geometric mean for the following numbers:  110, 500, 1700, and 31,000. List from smallest to largest and round to the nearest tenth. Section.
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  11.Suppose a researcher was interested in learning more about parents’ concerns when their children go away to college. The researcher asks the parents of 900 randomly selected freshman at a private college and the parents of 1,020 randomly selected freshman at a public college to rate their level of concern with.
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    1. [Objective:  Understanding variation]  A sticker on a new car advertises that it gets 34 miles per gallon, but cautions that results may vary.  Explain what variation means in this context. 2. [Objective:  Understanding data]  Consider the statement “Data are numbers in context.”  Consider a randomly selected group of newborn babies born.
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  11.In the context of the ANOVA test, which of the following phrases is equivalent to the phrase “variation within groups”? a.Variation due to error b.Residual variation c.Unexplained variation d.All of the above 12.A movie studio did a poll to determine whether women in different age groups watched different amounts of horror movies. Check the computer.
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  1.Does listening to music improve efficiency for mundane tasks?  In a study, researchers randomly assigned 50 similar adults to one of three groups.  All subjects were asked to stuff 400 envelopes.  Depending on which group they were assigned to, subjects heard Top 40 music, classical music, or no music while.
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  11.Suppose a random sample of 1,105 adults were asked about their opinion regarding salaries of full-time employees at a local state funded university. Respondents were asked whether salaries at the university were (a) too low, (b) adequate, or (c) too high. Respondents were also classified by income level. If we.
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  6.Compare the sampling distributions of the normally distributed test statistic z and the chi-square test statistic. How do the sampling distributions differ in shape and range of values? Use the following information to answer questions (7) – (8). Mars, manufacturer of M&Ms candies, used to publish the distributions of colors for.
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    11.Suppose state lawmakers are interested in finding out whether a newly instituted elementary school program about bullying is effective. A statistician divides the state into three regions then randomly selects a sample of thirty elementary schools from each region. Students at the selected schools complete a questionnaire about bullying. What.
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