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Study Resources (Statistics)

  14.Blood pressure Researchers developing new drugs must be concerned about possible side effects. They must check a new medication for arthritis to be sure that it does not cause an unsafe increase in blood pressure. They measure the blood pressures of a group of 12 subjects, then administer the drug.
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  6.[Objective:  Use the Empirical rule to determine unusual values]  Suppose a female professor is offered a position with an annual salary of $100,000.  Compared to the women from the nine institutions in the study, would this be an unusually good salary?  Explain. 7.[Objective:  Understand and apply the Empirical Rule]  In your.
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  __1. Which statement correctly compares t-distributions to the normal distribution? I.t distributions are also mound shaped and symmetric. II.t distributions have less spread than the normal distribution. III.As degrees of freedom increase, the variance of t distributions becomes smaller. A)I only B) II only C) I and II only D).
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      The dotplot shows how many times a computer was used daily at a public library during a 30-day period.  Use information from the dotplot to answer questions (1) and (2). Number of daily logins 1.[Objective:  Interpret visual displays of numerical data]  Describe the shape of the distribution in context? 2.[Objective:  Interpret visual displays.
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  Use the following data to answer questions (16)-(18).  Here are the scores on a recent statistics midterm exam (Scores have been listed from lowest to highest).  A histogram showing the distribution is also included. 16.[Objective:  Determine the most appropriate typical value for skewed data]  Which measure of center, mean or median,.
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      1.[Objective:  Interpret visual displays of numerical data]  For twenty days a record store owner counts the number of customers who purchase an album by a certain artist.  The data and a dotplot of the data are shown below: Data set: 1, 3, 4, 4, 5, 6, 7, 2, 3, 4, 4, 5,.
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  16.[Objective:  Show ability to judge reliability and validity of conclusions of a statistical study]  Name two of the four key features of a well-designed controlled experiment.  When is it important to have a welldesigned controlled experiment? 1-4       Chapter 1 Test C For questions (17) and (18), use the following description of a.
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  11.[Objective:  Recognize the important features of a numerical distribution]   Based on the histogram in question (10), would it be unusual to be on hold for 5 minutes or more at this call center? a.Yes, it would be unusual. b.No, it would not be unusual. c.Not enough information given. 12.[Objective:  Recognize the important features of.
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  1.[Objective:  Analyze a scatterplot and recognize trends]  The scatterplot below shows the hat size and IQ of some adults.  Is the trend positive, negative, or near zero? a.Positive b.Negative c.Near Zero 2.[Objective:  Analyze a scatter plot and recognize trends]  The scatterplot below shows the number of tackles received and the     number of concussions received.
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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 Chapter 1 Test B       1-3 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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  6.[Objective:  Recognize the important features of a numerical distribution]  Define the important features to look for when presented with a numerical distribution. 7.[Objective:  Predict the shape of a distribution]  A used car salesman decides to track the number of cars he sold each week for the past twelve months.  Typically, the.
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  11.[Objective:  Recognize the important features of a numerical distribution]  About what percent of girls spent 5 hours or less on extracurricular athletic activities each week?  Round to the nearest whole percent. 12.[Objective:  Recognize the important features of a numerical distribution]  You have created a histogram showing the distribution of the amount.
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  11.Approval rating The President’s job approval rating is always a hot topic. Your local paper conducts a poll of 100 randomly selected adults to determine the President’s job approval rating. A CNN/USA Today/Gallup poll conducts a poll of 1010 randomly selected adults. Which poll is more likely to report that.
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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 twentyfour pack. c.The individual weights in ounces of.
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  16.[Objective:  Recognize the important features of a categorical bar graph]  Did one group (males or females) show more variability in car color? 17.[Objective:  Recognize the important features of a categorical bar graph]  Write a sentence to compare color preferences or males and females. A survey was conducted which asked college students, “What.
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  16.Graduation tests Many states mandate tests that have to be passed in order for students to graduate with a high school diploma. A local school superintendent believes that after-school tutoring will improve the scores of students in his district on the state’s graduation test. A tutor agrees to work with.
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  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 (8)-(11).  A.
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  11.[Objective:  Perform percentage or rate calculations given data that is organized in a two-way table] Overall, what percentage of the sample supports the helmet law?  Round to the nearest whole percent. Chapter 1 Test C      1- 3 Answer questions (12)-(14) using the following table showing fatal injury counts by four major categories from.
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  __1. Which statement correctly compares t-distributions to the Normal distribution? I.t distributions are also mound shaped and symmetric. II.t distributions are more spread out than the normal distribution. III.As degrees of freedom increase, the variance of t distributions becomes larger. A) I only      B) II only      C) I and II.
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  12. Test identification Suppose you were asked to analyze each of the situations described below. (NOTE: Do not do these problems!) For each, indicate which procedure you would use (pick the appropriate number from the list), the test statistic (z, t, or ?2 “chi-squared”), and, if t or c2 , the number of.
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  11.[Objective:  Calculate z-scores and use to compare relative standing]  The average grade on an algebra exam was 76% with a standard deviation of 6 percentage points.  The average grade on a chemistry exam was 81% with a standard deviation of 2 percentage points.  Julie got a grade of 83% on.
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  14.Depression A recent psychiatric study from the University of Southampton observed a higher incidence of depression among women whose birth weight was less than 6.6 pounds than in women whose birth weight was over 6.6 pounds. Based on a P-value of 0.0248 the researchers concluded there was evidence that low.
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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 in.
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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 Chapter 1 Test A       1-3 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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    1.[Objective:  Analyze a scatter plot and recognize trends]  Doctors believe that smoking cigarettes lowers lung capacity.  To test this they measured the lung capacity (in liters) and the number of cigarettes smoked in a typical day for a sample of adults.  Is the scatterplot below consistent with the researcher’s hypothesis? a.Yes,.
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  11.[Objective:  Recognize the important features of a numerical distribution]  Which of the following statements best describes the distribution and variability of the histogram below? The data in the histogram summarizes length of time on hold for a collection of customers calling a repair call center. Length of time on hold  in.
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Of the 23 first-year male students at State U. admitted from Jim Thorpe High School, 8 were offered baseball  scholarships and 7 were offered football scholarships. The  University admissions committee looked at the students’ composite ACT scores (shown in the table), wondering if the  University was lowering their.
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  11.[Objective:  Use the Empirical Rule to determine ranges of usual values]   For what percentage of great lakes states would you expect the economic impact from fishing to be between $234.5 and $401.5 (in millions of dollars)? a.95% b.68% c.Nearly all d.None of the above 12.[Objective:  Use the Empirical Rule to determine ranges of usual values]  .
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  11.[Objective:  Use the Empirical Rule to determine ranges of usual values]   For what percentage of great lakes states would you expect the economic impact from fishing to be between $151.00 and $485.00 (in millions of dollars)? a.95% b.68% c.Nearly all d.None of the above 12.[Objective:  Use the Empirical Rule to determine ranges of usual values]  .
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  11.Peanut M&Ms According to Mars, Incorporated, peanut M&M’s are 12% brown, 15% yellow, 12% red, 23% blue, 23% orange, and 15% green. On a Saturday when you have run out of statistics homework, you decide to test this claim. You purchase a medium bag of peanut M&M’s and find 39.
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  11.College admissions According to information from a college admissions office, 62% of the students there attended public high schools, 26% attended private high schools, 2% were home schooled, and the remaining students attended schools in other countries. Among this college’s Honors Graduates last year there were 47 who came from.
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  13.Test identification (NOTE: Do not do these problems!) For each, indicate which procedure you would use, the test statistic (z, t, or χ2 “chi-squared”), and, if t or χ2, the number of degrees of freedom. A choice may be used more than once. 1.proportion – 1 sample 2.difference of proportions.
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  11.[Objective:  Understand the components of a linear regression model]  Suppose it has been established that “annual income” and “Years of college” are linearly related, and that the relationship can be modeled using the following equation:  Annual Income = $23,400+$7200(Years of College).  In this model, “Annual Income” is the __?__ variable,.
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  15.Student progress The Comprehensive Test of Basic Skills (CTBS) is used by school district to assess student progress. Two of the areas tested are math and reading. A random sample of student results was reviewed to determine if there is an association between math and reading scores on the CTBS..
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