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February 1, 2015

February 1, 2015

**Recent Homework Questions About Statistics**

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**Statistics- Multiple Choice Question**

The investigators suspect that military men may not tell the truth about visiting a CSW. Some may say they did visit a CSW when they actually did not; others will say they did not visit a CSW when they actually did. Is this: A. Nondifferential misclassification of exposure B. ...
*Thursday, September 19, 2013 at 9:50pm*

**Statistics (Please help!!!)**

The investigators suspect that military men may not tell the truth about visiting a CSW. Some may say they did visit a CSW when they actually did not; others will say they did not visit a CSW when they actually did. Is this: A. Nondifferential misclassification of exposure B. ...
*Thursday, September 19, 2013 at 9:29pm*

**Statistics**

A golf ball is dropped from 15 different heights (in inches) and the height of the bounce is recorded (in inches.) The regression analysis gives the model y-hat = -0.4 + 0.70 (drop height) where y-hat is the predicted bounce height of the golf ball. A golf ball dropped from 71...
*Wednesday, September 18, 2013 at 7:40pm*

**Statistics**

A carload of stone taken from a quarry by the plug-and-feather method contains pieces of stone have a mean weight of 1,500 pounds and a total weight of 36,000 pounds. Another carload of stone produced by the explosive method (where stone is blasted into random shapes by ...
*Wednesday, September 18, 2013 at 6:21pm*

**question**

im a freshmen and i wan to become a architect what courses should i take in highschool and is it beter to take statistics or precalculas
*Tuesday, September 17, 2013 at 11:21pm*

**statistics**

The international bottled water association says that Americans on the average drink 4.6 (8oz) servings of water a day. Assume that the number of 8oz. servings of water is approximately normally distributed with a standard deviation of 1.8 servings what proportion of Americans...
*Tuesday, September 17, 2013 at 9:26pm*

**Statistics**

If someone makes random guesses for each NCAA Basketball Tournament game, what is the probability of picking the winner in each game?
*Tuesday, September 17, 2013 at 3:54pm*

**statistics**

Based on published real estate research, 65% of homes for sale have garages, 20% have swimming pools, and 18% have both features. i. Given that a home for sale has a garage, what’s the probability that it also has a pool
*Monday, September 16, 2013 at 6:08pm*

**statistics**

You and your friend decide to get your cars inspected. You are informed that 70% of cars pass inspection. If the event of your car’s passing is independent of your friend’s car: iii. What is the probability that both of the cars pass inspection (6 points)? a. 60% b. ...
*Monday, September 16, 2013 at 5:32pm*

**statistics**

Suppose scores on the mathematics section of the SAT follow a normal distribution with mean 540 and standard deviation 120. ACT math scores are normally distributed with a mean of 18 and a standard deviation of 8. What score on the ACT is equivalent to a score of 750 on the ...
*Monday, September 16, 2013 at 1:46pm*

**statistics**

Suppose scores on the mathematics section of the SAT follow a normal distribution with mean 540 and standard deviation 120. ACT math scores are normally distributed with a mean of 18 and a standard deviation of 8. What score on the ACT is equivalent to a score of 750 on the SAT
*Sunday, September 15, 2013 at 11:07pm*

**Statistics**

The annual snowfall in a town can be represented by the Normal model N(46, 6.8). In about 2.5% of the years, the annual snowfall in this town will exceed: A) 46 inches B) 39.2 inches C) 52.8 inches D) 59.6 inches E) 66.4 inches I don't know how to set this problem up to ...
*Sunday, September 15, 2013 at 4:26pm*

**Statistics **

Here's the five- number summary for the distribution of cigarette taxes (in cents) among the 50 states and Washington, D.C. in the United States. Min. = 2.5, Q1= 36, Median = 60, Q3= 100, Max. = 205 About what proportion of the states have cigarette taxes (i) greater than ...
*Saturday, September 14, 2013 at 8:21am*

**STATISTICS**

TRUE OR FALSE? Simple regression cannot be applied when r of two variables is very low.
*Friday, September 13, 2013 at 2:22pm*

**Statistics**

I have no idea on how to answer this question... "Use technology or a standard normal distribution table to find the area to the left of z=1.58. Do I plug in 1.58 in my calculator to find the answer?
*Friday, September 13, 2013 at 10:54am*

**Statistics**

I have no idea on how to answer this question... "Use technology or a standard normal distribution table to find the area to the left of z=1.58. Do I plug in 1.58 in my calculator to find the answer?
*Friday, September 13, 2013 at 10:46am*

**statistics**

A sample of 106 students, the researchers reported the following statistics...mean= 13.2 s=19.5 Explain why the distribution for these 106 students cannot be symmetric and given this, what % of 106 students fall within the x+/-2s? I understand it cannot be symmetric b/c the ...
*Friday, September 13, 2013 at 12:24am*

**statistics**

First graders who misbehave in school may be more likely to be regular smokers as young adults according to a new study presented in the July 2004 issue of the American Journal of Epidemiology. After following a group of U.S. first graders for 15 years, it was found that among...
*Thursday, September 12, 2013 at 6:51pm*

**Statistics**

Emissions of sulfur dioxide by industry set off chemical changes in the atmosphere that result in "acid rain." The acidity of liquids is measured by pH on a scale of 0 to 14. Distilled water has pH 7.0, and lower pH values indicate acidity. Normal rain is somewhat ...
*Tuesday, September 10, 2013 at 6:55pm*

**MATH**

A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability, the mean for people in general is 0 and the standard ...
*Monday, September 9, 2013 at 5:29pm*

**statistics**

"suppose that IQ scores have a bell-shaped distribution with a mean of 97 and standard deviation of 17.Using empirical rule, what percentage of IQ score are less than 46?"
*Sunday, September 8, 2013 at 11:59pm*

**Statistics**

The owner of the Finer Diner submitted a proposal to you in hopes of selling the business to you. His asking price is $250,000. Your financial institution advises that your monthly payment to finance that amount would be $1850.00. This is in addition to other business expenses...
*Sunday, September 8, 2013 at 7:27pm*

**statistics**

the life spans of three randomly selected tires are 31,400 miles, 40,600 miles and 36,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
*Sunday, September 8, 2013 at 4:58pm*

**Statistics / Business**

According to the National Humane Society, "Stray Cost" or the cost of the care and feeding for a stray dog is $419.00 per year. This amount does not include veterinarian care, but only food, water and shelter. It was found that the standard deviation of this "...
*Sunday, September 8, 2013 at 2:27pm*

**statistics**

P(z < -1.5 or z > 2.50) =
*Saturday, September 7, 2013 at 3:39pm*

**STATISTICS**

Researchers asked questions in 1001 randomly selected adults in Russia. We found a statistically significant, strong positive correlation between income and the number of recycling bins filled their houses per week (r = 0,77). Choose the best interpretation of the result. &...
*Friday, September 6, 2013 at 6:19am*

**STATISTICS**

True or False? A researcher is interested in studying whether there is a correlation of IQ with health. For this purpose he selected a sample of 261 people and asked them to complete two questionnaires: one for IQ and one for health. After evaluating the questionnaires each ...
*Friday, September 6, 2013 at 6:15am*

**Statistics (Please help!!!)**

Are there tables comparing and contrasting the following or how would you write these up? 1. Ecological Studies and Cross-Sectional Studies 2. Case control studies and Cohort studies 3. Measurement bias (aka information bias) and selection bias 4. Nondifferential ...
*Friday, September 6, 2013 at 4:46am*

**Statistics**

The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem, determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.
*Friday, September 6, 2013 at 12:39am*

**statistics**

A car dealer is using the number of years customers have owned their vehicles to predict how long it will be before they elect to replace them. The correlation between the two is rxy = -.723 (the longer they have owned their present vehicles, the more quickly they are expected...
*Thursday, September 5, 2013 at 5:23pm*

**Statistics (Please help!!!)**

Here is the question: If gene frequencies are in equilibrium, the genotypes, AA, Aa, and aa occur in a population with frequencies (1-0)^2, 20 (1-0), and 0^2. Plato et al.published the following data on haptoglobin type in a sample of 190 people: Hp1-1 = 10 Hp1-2 = 68 Hp2-2 = ...
*Wednesday, September 4, 2013 at 8:56pm*

**Statistics (Please help!!!)**

The following table gives the number of deaths due to accidental falls for each month during 1970. Is there any evidence for a departure from uniformity in the rate over time? That is, is there a seasonal pattern to this death rate? If so, describe its pattern and speculate as...
*Wednesday, September 4, 2013 at 8:48pm*

**Statistics**

A population has µ=100 and õ=20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain your answer
*Monday, September 2, 2013 at 10:11pm*

**statistics**

7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
*Sunday, September 1, 2013 at 12:25am*

**Statistics**

Going to the movies tonight with one friend. Is it more beneficial for me to pay for the tickets or food? Please explain your reasoning
*Saturday, August 31, 2013 at 12:51pm*

**Statistics**

1. A pie chart can not be used for a frequency distribution with overlapping classes. A) True B) False True?
*Friday, August 30, 2013 at 3:55pm*

**STATS**

A researcher conducted a survey on a sample of 2000 college-students in order to examine the relationship between academic achievement and procrastination of studying. Using several indicators and plots of the descriptive statistics, found that in the data were many outlier ...
*Friday, August 30, 2013 at 9:34am*

**Statistics**

A researcher wants to study the effect of gender on mathematical ability of lyceum children. From the data gathered tried to construct a scatter diagram. He did not succeed to make it though. Why? a. Had not collected enough data. b. He did not know how to construct it...
*Friday, August 30, 2013 at 7:29am*

**STATISTICS**

Which of the following correlation coefficients is higher? a. -0.68 b. 0.60 c. 0.68 d. a and c e. None of the above a and c right?
*Friday, August 30, 2013 at 7:19am*

**Statistics**

The scatter diagram shows: a. The frequency with which each value occurs in the data. b The values of a variable designed in comparison with the values of a second variable. c. The mean data sets. d. The percentage of data belonging to different ...
*Friday, August 30, 2013 at 7:19am*

**accounting statistics**

Find the balance at the end of 6 years of $5000 investment in an account with a nominal annual rate of interest of 2.5% compounded quarterly over the first two years and then grows according to nominal annual rate of discount of 6% convertible monthly over the remaining 4 ...
*Thursday, August 29, 2013 at 7:04pm*

**Statistics Ms. Sue**

Thank you Ms. Sue for the answer. I just wanted to know how you arrived at that $31000, because I have a number of problems like that one. Thank you. Mary
*Wednesday, August 28, 2013 at 7:22pm*

**Statistics**

linear correlation between the number of years in college versus average pay. average pay= 1,000 + 15,000x where x is the number of years in college. What would your average pay be if you were in college 2 years based on the model?
*Wednesday, August 28, 2013 at 6:52pm*

**Statistics**

A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had ...
*Wednesday, August 28, 2013 at 6:08pm*

**Statistics**

linear correlation between the number of years in college versus average pay. average pay= 1,000 + 15,000x where x is the number of years in college. What would your average pay be if you were in college 2 years based on the model?
*Wednesday, August 28, 2013 at 5:06pm*

**Statistics**

I am respectfully requesting help with the following assignment. I am struggling in this chapter of statistics... Define the term sample? A) A sample is a numeric characteristic of a sample B) A sample is a numeric characteristic of a population C) A sample is the entire ...
*Monday, August 26, 2013 at 2:08pm*

**statistics**

1.What’s the most appropriate procedure for evaluating the relationship between tenure and divorce? 2.What is the correlation and how can it be interpreted in terms of magnitude, direction and practical importance? 3.How much of whether executives have been divorced can ...
*Sunday, August 25, 2013 at 11:47pm*

**Intro to Healthcare Statistics**

Discuss how statistics are generated and how statistical information is used by healthcare organizations. Explore the NC State Center for Health Statistics at the following website and discuss at least two types of statistic health information that NC collects.
*Sunday, August 25, 2013 at 7:29pm*

**Statistics**

A statistician believes that in her town each child born has a 50% chance of being a girl, independently of all other children. There are 281 three-child families in her town; 39 of these families have no girls, 94 have one girl, 115 have two girls, and the remaining 33 have ...
*Sunday, August 25, 2013 at 8:45am*

**statistics**

Use the following scenario to answer the next 5 questions. Millions of Americans are subjected to drug testing in the workplace. The tests are not always reliable. A false positive rate of 5% is considered to be a conservative estimate. Suppose that there are 20 employees in ...
*Saturday, August 24, 2013 at 7:10pm*

**Statistics**

The next three questions refer to the following situation. Data from previous years reveal that the distribution if first exam scores in an introductory statistics class is approximately normal with a mean of 72 and a standard deviation of 12. 16) Given that the passing score ...
*Saturday, August 24, 2013 at 6:47pm*

**Statistics**

A statistician analyzing a randomized controlled experiment has tested Null: The treatment does nothing. Alternative: The treatment does something. using a 4% cutoff for P-values. The P-value of the test turns out to be about 1.8%. 1. The conclusion of the test is -The ...
*Saturday, August 24, 2013 at 6:08am*

**statistics**

Researchers conducted a survey of parents of 66 kindergarten children. The parents were asked whether they played games with their children. The parents were divided into two groups: working class and middle class. The researchers wanted to know if there was an association ...
*Friday, August 23, 2013 at 9:08pm*

**Statistics**

A simple random sample of cars in a city was categorized according to fuel type and place of manufacture. domestic foreign gasoline 146 191 diesel 18 26 gasoline/ 51 79 electricity hybrid 1. If the two variables were independent, the expected number of foreign gas/electric ...
*Wednesday, August 21, 2013 at 4:22pm*

**Statistics**

According to a genetics model, plants of a particular species occur in the categories A, B, C, and D, in the ratio 9:3:3:1. The categories of different plants are mutually independent. At a lab that grows these plants, 218 are in Category A, 69 in Category B, 84 in Category C...
*Wednesday, August 21, 2013 at 4:16pm*

**Statistics**

According to DeVeaux/Velleman, the best way to succeed in the study of statistics is to memorize definitions and learn equations? True or False I chose True
*Wednesday, August 21, 2013 at 4:09pm*

**Statistics**

Is GPA a quantitative or categorical variable? I think it is quantitative because it consists of numbers...
*Wednesday, August 21, 2013 at 3:54pm*

**Statistics**

A simple random sample of cars in a city was categorized according to fuel type and place of manufacture. domestic foreign gasoline 146 191 diesel 18 26 hybrid 51 79 Are place of manufacture and fuel type independent? If the two variables were independent, the chance that a ...
*Saturday, August 17, 2013 at 9:19am*

**Statistics**

According to a genetics model, plants of a particular species occur in the categories A, B, C, and D, in the ratio 9:3:3:1. The categories of different plants are mutually independent. At a lab that grows these plants, 218 are in Category A, 69 in Category B, 84 in Category C...
*Saturday, August 17, 2013 at 8:39am*

**statistics**

A group of scientists is studying whether a new medical treatment has an adverse (bad) effect on lung function. Here are data on a simple random sample of 10 patients taken from a large population of patients in the study. Both variables are measurements, in liters, of the ...
*Saturday, August 17, 2013 at 2:45am*

**Statistics**

In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
*Friday, August 16, 2013 at 3:09am*

**statistics**

Suppose test scores follow a normal distribution with ì= 80 and ó = 5. Calculate the z-score for a score of 90.
*Thursday, August 15, 2013 at 2:59pm*

**Statistics**

Use the following figure to answer questions 12-14: Figure 3b (British J Derm 2008) comes from a randomized trial of DHA versus a placebo pill for treating eczema. The figure shows boxplots of the eczema severity score, SCORAD, at baseline and week 8 for each group. SCORAD ...
*Thursday, August 15, 2013 at 12:13pm*

**Statistics**

Use the following table to answer questions 7 and 8: This table displays results from a prospective cohort study evaluating meat intake and mortality. The table displays hazard ratios for mortality by quintile of red meat intake. Table 2. Multivariate Analysis for Red, White, ...
*Thursday, August 15, 2013 at 11:58am*

**Statistics**

A student is taking a true/false exam with 15 questions. If he guesses on each question, what is the probability he will get at least 13 question right?
*Wednesday, August 14, 2013 at 1:30pm*

**Statistics**

Given that a population of scores is normally distriibuted with u=100 and o=8, determine the following: a. The percentile rank of a score of 120 b. The perentage of scores that are below a score of 99 c. The percentage of scores that are between a score of 101 and 122 d. The ...
*Wednesday, August 14, 2013 at 1:26pm*

**Statistics**

Please help! I know that E is incorrect. Researchers conducted a case-control study to identify risk factors for kidney cancer. They asked 50 cases and 50 controls about 100 different exposures and personal characteristics, and calculated the odds ratio for kidney cancer for ...
*Wednesday, August 14, 2013 at 9:36am*

**STATISTICS**

Researchers conducted a case-control study to identify risk factors for kidney cancer. They asked 50 cases and 50 controls about 100 different exposures and personal characteristics, and calculated the odds ratio for kidney cancer for each risk factor. They found statistically...
*Tuesday, August 13, 2013 at 8:50pm*

**statistics**

Researchers reported that in a sample of U.S. women aged 50 to 54 who underwent mammography, 14.4% were recalled for further evaluation; however, in a similar sample of women undergoing mammography in the United Kingdom, only 7.6% were recalled for further evaluation. What are...
*Tuesday, August 13, 2013 at 2:41pm*

**Statistics**

Suppose you want to figure out what to do with your degree in psychology. You ask some fellow students from your psychology program who recently graduated to find out what they are doing with their degree and how much it pays. What type of sampling is this? What are the ...
*Tuesday, August 13, 2013 at 4:27am*

**statistics**

In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
*Monday, August 12, 2013 at 11:40pm*

**statistics**

In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
*Monday, August 12, 2013 at 11:40pm*

**Statistics**

Bob takes an online IQ test adn finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the poulation would score higher than Bob? Lower than Bob?
*Sunday, August 11, 2013 at 11:32pm*

**Math/Statistics**

A statistics teacher believes that the final exam grade for her elementary stats class have a normal distribution with a mean of 82 and a standard deviation on 8. Find the score which separates the top 10% of the scores from the lowest 90% of the scores.
*Sunday, August 11, 2013 at 8:51pm*

**statistics**

1. I took a sample of the grade point averages for students in my class. For 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was:
*Sunday, August 11, 2013 at 2:58am*

**STATISTICS**

A study examining the relationship between fetal X-ray exposure and a particular type of childhood blood cancer found the following odds ratio (and 95% confidence interval) for the association: 2.44 (0.95 to 6.33). This result would likely be considered: a. clinically ...
*Saturday, August 10, 2013 at 7:12pm*

**STATISTICS**

You are performing a cohort study to look at risk factors for breast cancer in postmenopausal women. If the probability of developing breast cancer among smokers is .05 for the study duration, then if you sample 100 smokers, how many do you expect to develop the disease? Give ...
*Saturday, August 10, 2013 at 7:10pm*

**STATISTICS**

In a psychology experiment in which 100 volunteers were asked to read a paragraph about an engineer, 65 assumed that the engineer was male despite the fact that the paragraph did not specify gender (and avoided gendered pronouns such as “he” or “she”). If ...
*Saturday, August 10, 2013 at 7:07pm*

**Statistics**

A study of generator related carbon monoxide deaths showed that a sample of 6 recent years had a variance of 16.8 deaths per year. Find the 99% confidence interval of the true variance
*Saturday, August 10, 2013 at 9:55am*

**statistics**

In a simple random sample of 250 father-son pairs taken from a large population of such pairs, the mean height of the fathers is 68.5 inches and the SD is 2.5 inches; the mean height of the sons is 69 inches and the SD is 3 inches; the correlation between the heights of the ...
*Saturday, August 10, 2013 at 3:26am*

**Statistics**

In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
*Saturday, August 10, 2013 at 3:20am*

**Statistics**

A box contains 10 items, of which 3 are defective and 7 are non-defective. Two items are randomly selected, one at a time, with replacement, and x is the number of defective items in the sample. To look up the probability of a defective item being drawn from the box, using a ...
*Thursday, August 8, 2013 at 7:25pm*

**statistics**

A study of hours devoted to a graduate course outside of classroom time generates a mean score of 90 with a standard deviation of 20. The mean age of the students was 31 with a standard deviation of 5 years. What is the relative dispersion of the two data sets? A. 2.22%; 1.6% ...
*Thursday, August 8, 2013 at 3:05pm*

**STATISTICS**

A particular diagnostic test for disease X has a sensitivity of 90% and a specificity of 90%. What is the negative predictive value of the test? 90% 10% 1% 18% It cannot be determined from the information given.
*Wednesday, August 7, 2013 at 4:13pm*

**Statistics**

A stationary store has decided to accept a large shipment of ball-point pens if an inspection of 20 randomly selected pens yields no more than two defective pens. a) find the probability that this shipment is accepted if 5% of the total shipment is defective. b) find the ...
*Wednesday, August 7, 2013 at 10:21am*

**STATISTICS**

Which of the following would increase the width of a confidence interval? Changing from a 99% to 95% confidence level. Increasing the variability of the outcome. Increasing the sample size. Removing an outlier from the data
*Wednesday, August 7, 2013 at 5:47am*

**STATISTICS**

A study examining the relationship between fetal X-ray exposure and a particular type of childhood blood cancer found the following odds ratio (and 95% confidence interval) for the association: 2.44 (0.95 to 6.33). This result would likely be considered: clinically significant...
*Wednesday, August 7, 2013 at 5:46am*

**STATISTICS**

You are performing a cohort study to look at risk factors for breast cancer in postmenopausal women. If the probability of developing breast cancer among smokers is .05 for the study duration, then if you sample 100 smokers, how many do you expect to develop the disease? Give ...
*Wednesday, August 7, 2013 at 5:45am*

**Writing**

This time I hope I improve. Writing is a skill that must be practiced. In order to be good at writing I must read a lot, right? I won't survive in college if I am not able to write superfluos essays,right????? *Thank you,Writeacher for your patience. I know you might be ...
*Wednesday, August 7, 2013 at 12:53am*

**STATISTICS**

You are performing a cohort study to look at risk factors for breast cancer in postmenopausal women. If the probability of developing breast cancer among smokers is .05 for the study duration, then if you sample 100 smokers, how many do you expect to develop the disease? Give ...
*Tuesday, August 6, 2013 at 3:57pm*

**STATISTICS**

Standard error: Is always the standard deviation divided by the square root of n. Is a measure of the variability of a sample statistic. Increases with bigger sample sizes. All of the above.
*Tuesday, August 6, 2013 at 3:54pm*

**STATISTICS**

Which of the following would increase the width of a confidence interval? Changing from a 99% to 95% confidence level. Increasing the variability of the outcome. Increasing the sample size. Removing an outlier from the data
*Tuesday, August 6, 2013 at 3:52pm*

**STATISTICS**

A study was conducted to examine the peer review process. The investigators hypothesized that reviewers suggested by authors would give more favorable reviews than reviewers picked by journal editors. They obtained data on 40 manuscripts that had been reviewed by 1 author-...
*Tuesday, August 6, 2013 at 3:50pm*

**STATISTICS**

In a survey of 1000 registered U.S. voters, 55% respond that they support health care reform. What is the 95% confidence interval for the true percentage of U.S. registered voters who support health care reform? 50%-60% 55%-60% 51%-59% 52%-58% 49%-47%
*Tuesday, August 6, 2013 at 3:48pm*

**STATISTICS**

The following table comes from a hypothetical case-control study that compared adults with moderate-to-severe acne (cases) to adults without acne (controls). The researchers examined the relationship between smoking and acne. The prevalence of moderate-to-severe acne in the ...
*Tuesday, August 6, 2013 at 3:48pm*

**STATISTICS**

Assume that the probability of developing lung cancer in smokers is 15%; the probability of developing lung cancer in non-smokers is 1%; and the prevalence of smokers in the U.S. is 20%. If a person is diagnosed with lung cancer, what is the probability that he/she is a smoker...
*Tuesday, August 6, 2013 at 3:46pm*

**STATISTICS**

In a cross-sectional study of heart disease and gender in middle-aged men and women, 10% of men in the sample had prevalent heart disease compared with only 5% of women in the sample. After adjusting for age in multivariate logistic regression, the odds ratio for heart disease...
*Tuesday, August 6, 2013 at 3:44pm*

**STATISTICS**

Researchers conducted a case-control study to identify risk factors for kidney cancer. They asked 50 cases and 50 controls about 100 different exposures and personal characteristics, and calculated the odds ratio for kidney cancer for each risk factor. They found statistically...
*Tuesday, August 6, 2013 at 3:43pm*

**STATISTICS**

In a psychology experiment in which 100 volunteers were asked to read a paragraph about an engineer, 65 assumed that the engineer was male despite the fact that the paragraph did not specify gender (and avoided gendered pronouns such as “he” or “she”). ...
*Tuesday, August 6, 2013 at 3:42pm*

**STATISTICS**

Researchers reported that in a sample of U.S. women aged 50 to 54 who underwent mammography, 14.4% were recalled for further evaluation; however, in a similar sample of women undergoing mammography in the United Kingdom, only 7.6% were recalled for further evaluation. What are...
*Tuesday, August 6, 2013 at 3:42pm*

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