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December 22, 2014

December 22, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**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*

**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
*Tuesday, August 6, 2013 at 3:41pm*

**Statistics**

Blossom's Flowers purchases roses for sale for Valentine's Day. The roses are purchased for $10 a dozen and are sold for $20 a dozen. Any roses not sold on Valentine's Day can be sold for $5 per dozen. The owner will purchase 1 of 3 amounts of roses for Valentine&#...
*Tuesday, August 6, 2013 at 10:27am*

**statistics**

On average, you receive four pieces of junk mail a day. For a randomsample of 10 weekends find the probability that at least 8 weekends youreceive exactly three pieces of junk mail?
*Tuesday, August 6, 2013 at 6:39am*

**statistics**

Identify the type I error and the type II error that is a hypothesis. The percentage of households with more than 1 pet is equal to 65%
*Sunday, August 4, 2013 at 7:37pm*

**Statistics **

The distribution of cholesterol levels of the residents of a state closely follows the normal curve. Investigators want to test whether the mean cholesterol level of the residents is 200 mg/dL or lower. A simple random sample of 12 residents has a mean cholesterol level of 185...
*Sunday, August 4, 2013 at 11:23am*

**Statistics **

A statistical test is performed, and its P-value turns out to be about 3%. Which of the following must be true? Pick all that are correct. The null hypothesis is true. There is about a 3% chance that the null hypothesis is true. The alternative hypothesis is true. There is ...
*Sunday, August 4, 2013 at 11:19am*

**statistics**

There are two boxes, each with several million tickets marked “1” or “0”. The two boxes have the same number of tickets, but in one of the boxes, 49% of the tickets are marked “1” and in the other box 50.5% of the tickets are marked “1”...
*Friday, August 2, 2013 at 6:40pm*

**statistics**

Archie must travel to a foreign country where a deadly strain of flu has ravaged the population. Already, 34% of the population has succumbed to the flu and died. There is a vaccine, but because the flu is extremely contagious, it spreads quite rapidly, and to date only 1 out ...
*Friday, August 2, 2013 at 6:06pm*

**english**

If you go to the Internet and do a research for statistics to back up your argument for a speech you are writing for your Communications class, it is considered: A. primary research. B. investigative research. C. systematic research. D. secondary research.
*Friday, August 2, 2013 at 4:57pm*

**Math Statistics**

Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the difference in means ...
*Friday, August 2, 2013 at 1:51pm*

**Statistics**

A statistics student hands each of 300 classmates 2 cookies side by side on a plate. Of the 300 students, 171 choose the cookie that’s on their right hand side, and the remaining 129 choose the cookie that’s on their left. The student says, “That’s just ...
*Friday, August 2, 2013 at 4:52am*

**statistics**

A machine is designed to fill jars with 16 ounces of coffee. A consumer suspects that the machine is not filling the jars completely. A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's ...
*Friday, August 2, 2013 at 12:44am*

**statistics**

Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the difference in means ...
*Thursday, August 1, 2013 at 10:41pm*

**Statistics**

There are two boxes, each with several million tickets marked “1” or “0”. The two boxes have the same number of tickets, but in one of the boxes, 49% of the tickets are marked “1” and in the other box 50.5% of the tickets are marked “1...
*Thursday, August 1, 2013 at 1:21pm*

**Statistics**

A statistics student hands each of 300 classmates 2 cookies side by side on a plate. Of the 300 students, 171 choose the cookie that’s on their right hand side, and the remaining 129 choose the cookie that’s on their left. The student says, “That’s just ...
*Thursday, August 1, 2013 at 2:25am*

**statistics**

After one month of operation the health information services at community health center determined that there were two reords misfiled out of the 450 active records. What is the filing accuracy rate for this area?
*Thursday, August 1, 2013 at 12:28am*

**Statistics**

Of the 5,352 requests for medical records, 4,257 were located within the 20-minute time frame established by the supervisor as a qulaity improvement indicator. What is the rate of compliance in answering requests for records?
*Wednesday, July 31, 2013 at 11:03pm*

**math**

As you follow your favorite NBA basketball team’s statistics, you notice the point guard is successfully shooting 85% from the free-throw line for this season. Assuming he is fouled near the end of a game and shoots with that same success rate, what is the probability ...
*Wednesday, July 31, 2013 at 9:21pm*

**statistics**

Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the difference in means ...
*Wednesday, July 31, 2013 at 4:35pm*

**Statistics **

There are two boxes, each with several million tickets marked “1” or “0”. The two boxes have the same number of tickets, but in one of the boxes, 49% of the tickets are marked “1” and in the other box 50.5% of the tickets are marked “1”...
*Tuesday, July 30, 2013 at 5:46pm*

**statistics**

In a poll of 700 selected people in the USA who are 50 years or older, 20% said they would prefer a complete overhauling of the social security system. Estimate the population proportion of the USA of 50 years or older who would prefer a complete overhauling of the social ...
*Tuesday, July 30, 2013 at 1:52pm*

**statistics**

It is claimed the average age of employee in a large company is 50. A sample of 36 employees is taken and the average age was 49. The standard deviation of the population was 5. Use a level of significance of .05. What do you think of this claim?
*Tuesday, July 30, 2013 at 1:51pm*

**Statistics**

True or False Question: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in Problem 6. 6) “The test concludes that the die is biased towards the face with six ...
*Monday, July 29, 2013 at 4:36pm*

**Statistics**

Multiple Choice: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in the steps outlined in Problems 1-6. 3) If the null hypothesis were true, the expected number of ...
*Monday, July 29, 2013 at 4:33pm*

**Statistics**

Multiple Choice: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in the steps outlined in Problems 1-6. 2) The alternative hypothesis is a) The die is biased b) The...
*Monday, July 29, 2013 at 4:29pm*

**Statistics**

Multiple Choice: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in the steps outlined in Problems 1-6. 1) The null hypothesis is: a) The die is biased towards the ...
*Monday, July 29, 2013 at 4:27pm*

**statistics**

The length of country and western songs is normally distributed and has a mean of 200 seconds and a standard deviation of 30 seconds. Find the probability that a random selection of 9 songs will have mean length of 186.30 seconds or less. Assume the distribution of the lengths...
*Monday, July 29, 2013 at 3:14pm*

**Statistics**

A researcher surveyed college students to study their opinion about the proposed change in smoking rules. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them did not, and 5 had no opinion. This is not a binomial model because... A. ...the ...
*Monday, July 29, 2013 at 2:56pm*

**Math Statistics**

5. Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 36 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this ...
*Monday, July 29, 2013 at 1:15pm*

**Statistics**

There is a $2 raffle with a first prize of $10000, a second prize of $500, and a 3rd prize of $100. If 1000 tickets are sold find the expected value. How much should the raffle ticket cost to make this a fair game?
*Sunday, July 28, 2013 at 10:38pm*

**Statistics**

True or False. Help please! Statistics' students of a class of Lyceum want to calculate the average number of chocolate pieces in a standard package of biscuits SANTAS. They choose a random sample of biscuits, measure chocolate pieces in each cookie and calculate the 95% ...
*Sunday, July 28, 2013 at 3:12pm*

**Business Statistics**

The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 16 people reveals the mean yearly consumption to be 60 gallons with a standard deviation of 20 gallons. a. What is the value of the population mean? What is the best estimate of this value...
*Sunday, July 28, 2013 at 12:47pm*

**statistics**

Can you please tell me how to solve for the following? Pedro took an exam in a class in which the mean was 64 with a standard deviation of 6. If his z score was +3, what was his exam score? A students commute to school is normally distributed with a mean of 31 min and a ...
*Sunday, July 28, 2013 at 11:37am*

**Math Statistics**

2. A statistics professor has asked his students to flip coins over the years. He has kept track of how many flips land heads and how many land tails. Combining the results of his students over many years, he has formed a 95% confidence interval for the long-run population ...
*Saturday, July 27, 2013 at 2:19pm*

**Statistic/Psychology**

If the correlation between one's interest in statistics and being a "fun date" was -0.70, it would mean that: a. The higher someone's interest was in statistics, the more likely it would be that he or she is a fun date b. The higher someone's interest was...
*Friday, July 26, 2013 at 7:08pm*

**Statistics**

Multiple Choice Which of the following statements is true about the 95% confidence interval of the average of a sample? A) 95 of 100 avgs of samples will be within the limits of the confidence interval. B) There is a 95% chance the avg of the population to be within the limits...
*Friday, July 26, 2013 at 6:00am*

**Statistics**

True or False Questions. Statistics' students of a class of Lyceum want to calculate the average number of chocolate pieces in a standard package of biscuits SANTAS. They choose a random sample of biscuits, measure chocolate pieces in each cookie and calculate the 95% ...
*Friday, July 26, 2013 at 5:49am*

**Statistics**

The inside diameter of the automobile wheel bearing sets at a factory is expected to be normally distributed with a mean of 1.30inches and a standard deviation of 0.04 inches. What is the probability that a randomly selected wheel bearing will have an inside diameter of, a) ...
*Thursday, July 25, 2013 at 7:56pm*

**statistics**

The scores for standardized test are normally distributed with a mean of 300 and standard deviation of 39. If the test is given to 700 students, how many are expected to have scores between 300 and 378.
*Thursday, July 25, 2013 at 5:51pm*

**statistics**

A simple random sample of voters will be taken in a large state. Researchers will use the methods of our course to construct an approximate 95% confidence interval for the percent of the state’s voters who will vote for Candidate X. The minimum sample size needed to ...
*Thursday, July 25, 2013 at 8:07am*

**psychology**

15. Maria is a Hispanic female, Natasha is a Black female, and Joan is a White female. Each has a high school level education but no work . Statistics show that ..
A. Natasha will earn less than Maria
B. Joan will earn less than Natasha
...
*Thursday, July 25, 2013 at 7:34am*

**Math Statistics**

Students enrolled in an introductory statistics course at a university were asked to take a survey that indicated whether the student has a visual or verbal learning style. Of the 39 students who took the survey, 25 were judged to have a visual learning style and 14 were ...
*Thursday, July 25, 2013 at 1:09am*

**statistics**

Suppose that the average score on the GMAT exam is 500 and that the standard deviation of all scores is 100 points. You would expect approximately 95% of all GMAT scores to be between
*Wednesday, July 24, 2013 at 5:37pm*

**English.....**

The following passage is taken from an article by a contemporary poet about Clement Clarke Moore, the nineteenth-century writer best known as the author of “A Visit From Saint Nicholas.” If he wasn’t a myth maker himself, at least Clement ...
*Wednesday, July 24, 2013 at 1:16pm*

**Statistics**

Any ideas please? Simple random sample of voters will be taken in a large state. Researchers will construct an approximate 95% confidence interval for the percent of the state¢s voters who will vote for Candidate A. Find the minimum sample size needed to ensure that the ...
*Wednesday, July 24, 2013 at 3:17am*

**STATISTICS**

From a group of 12 people, you randomly select 3 of them. Find the probability that at least one of them is among the 3 oldest people in the group
*Wednesday, July 24, 2013 at 12:34am*

**STATISTICS**

According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. Compute the probability that two randomly selected peanut M&M’s are both blue. If you ...
*Wednesday, July 24, 2013 at 12:34am*

**STATISTICS**

From a group of 12 people, you randomly select 3 of them. Find the probability that at least one of them is among the 3 oldest people in the group
*Wednesday, July 24, 2013 at 12:02am*

**life orientation**

identify and dercribe 3 environmental health hazards that cause ill health,crises,and or disasters within ur community or any other community within s.a and globally.include evidence that is current of the identified issues(e.g graphs and statistics)
*Tuesday, July 23, 2013 at 4:13pm*

**Math Statistics**

3. Suppose 20% of all heart transplant patients do not survive the operation. a. Think about taking repeated random samples of 371 patients from this population. Describe how the sample proportion who die would vary from sample to sample. (Hint: Be sure to refer to the shape, ...
*Monday, July 22, 2013 at 11:50pm*

**statistics**

Suppose that two employees have to be fired from a group of seven: • Amy, female, age 35 • Bob, male, age 41 • Chad, male, age 43 • Diana, female, age 44 • Elvis, male, age 49 • Frank, male, age 61 • Ginger, female, age 62 Determine the ...
*Monday, July 22, 2013 at 11:24pm*

**statistics**

A government researcher wants to conduct a study to determine if there is a correlation between social security numbers and income. He collects the paired data from a random sample of 100 people. Should the methods of this chapter be used with the linear correlation ...
*Monday, July 22, 2013 at 9:39pm*

**Statistics**

True or False Question. I need help please. A sientific paper reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different ...
*Monday, July 22, 2013 at 4:27am*

**statistics**

1. A simple random sample of 400 students is taken at a large university. The average height of the sampled students is 68 inches and the SD is 2 inches. The distribution of heights in the sample follows the normal curve very closely. An approximate 68% confidence for the ...
*Sunday, July 21, 2013 at 9:42am*

**statistics**

1. A simple random sample of 400 students is taken at a large university. The average height of the sampled students is 68 inches and the SD is 2 inches. The distribution of heights in the sample follows the normal curve very closely. An approximate 68% confidence for the ...
*Sunday, July 21, 2013 at 4:38am*

**Vocabulary**

choose the term that matches the definition. building and construction. a.architecture b. engineering c.nursing d.statistics b
*Saturday, July 20, 2013 at 10:34pm*

**Statistics**

I need help with this please. It is a multiple choice question, so choose one from a,b,c please. I believe the correct is c. What do you think? Ari lives about 10 minutes away from the college to which he intend to attend a summer seminar of 10 weeks. There are two main routes...
*Saturday, July 20, 2013 at 7:46pm*

**Statistics**

I need help with this please. A researcher is designing a research study. He hopes to show that the results of an experiment are statistically significant. What size of p value would take? a) Large value of p b) Small value of p c) The size of the p value does not affect the ...
*Saturday, July 20, 2013 at 6:27am*

**Statistics**

An environmentalist do a study to investigate the effects of a specific herbicide in fish. Has 60 healthy fish and randomly distributes any fish or in the experimental group or the control group. The fish in the experimental group have higher indices enzymes. 1) Suppose that ...
*Friday, July 19, 2013 at 6:44pm*

**Statistics**

A research article reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different interpretations of this value p. Note which ...
*Friday, July 19, 2013 at 6:42pm*

**Statistics Help !!!!**

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college ...
*Friday, July 19, 2013 at 2:08am*

**STATISTICS**

WHAT DOES THE CENTRAL LIMIT THEOREM SAY ABOUT THE TRADITIONAL SAMPLE SIZE THAT SEPARATES A LARGE SAMPLE SIZE FROM A SMALL SAMPLE SIZE?
*Thursday, July 18, 2013 at 9:35pm*

**college statistics**

I am having a bit of trouble with the top half of the questions. I have an answer below for questions 5-10, is there anyway you can check those answers and help me with the rest I am having trouble with. Thank you. 1. The area to the right of 1.93 under Student's t-curve ...
*Thursday, July 18, 2013 at 12:10pm*

**college statistics**

I am having a bit of trouble with some of the questions. Some of the ones I put below have an answer, is there anyway you can check the answer and help me with the rest I am having trouble with. Your sociology teacher claims that 60 percent of American males are married. You ...
*Thursday, July 18, 2013 at 11:58am*

**math-statistics**

The following risk ratios give the increased risk for various diseases comparing two groups (exposed vs. unexposed). a. 2.5 (2.0, 3.0) b. 1.03 (1.02, 1.04) c. 6.0 (.85, 9.8) d. 0.98 (0.88, 1.08) e. 0.20 (.05, 1.05) Which risk ratios are statistically significant at the 0.05 ...
*Wednesday, July 17, 2013 at 7:55am*

**statistics**

A sample of 100 iron bars is said to be drawn from a large number of bars. Whose lengths are normally distributed with mean 4 feet and S.D 0.6ft. If the sample mean is 4.2 ft, can the sample be regarded as a truly random sample?
*Wednesday, July 17, 2013 at 2:49am*

**Vocabulary**

Building and construction A. Architecture B. Engineering C. Nursing D. Statistics im pretty sure its A
*Wednesday, July 17, 2013 at 1:35am*

**statistics**

Do students tend to improve their SAT mathematics (SAT-M) score the second time they take the test/
*Tuesday, July 16, 2013 at 9:01am*

**Statistics**

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college ...
*Tuesday, July 16, 2013 at 6:19am*

**Statistics**

The effect size in this hypothetical trial (2.7 fewer infections per 1000 vaccinated) is slightly smaller than the effect size found in the real 2009 HIV vaccine trial (2.8 fewer infections per 1000 vaccinated); so why is the p-value smaller? The hypothetical trial has less ...
*Monday, July 15, 2013 at 11:33pm*

**Statistics**

The Centers for Disease Control (CDC) collects yearly statistics on drinking behavior in the United States by surveying a random sample of U.S. adults. The following data display the percent of adults aged 18 years and over who had 5 or more drinks in 1 day at least once in ...
*Monday, July 15, 2013 at 11:31pm*

**statistics**

A hypothetical HIV vaccine trial involving 20,000 participants—10,000 in the vaccine group and 10,000 in the placebo group—had the following results: 6.3 infections per 1000 in the vaccine group and 9.0 infections per 1000 in the placebo group. I ran a computer ...
*Monday, July 15, 2013 at 9:00pm*

**Statistics**

A batch consists of 20 bad apples and 80 good ones. What is the probability of selecting 2 good apples when two are randomly selected if the first selection is replaced before the second is made?
*Monday, July 15, 2013 at 8:10am*

**statistics**

n a survey of 634 males ages 18-64, 392 say that they have gone to the dentist in the past year contrast 90% and 95% confidence intervals for the population proportions, interperate the results and compare withsof the confidence intervals
*Sunday, July 14, 2013 at 9:20pm*

**Statistics Help !! **

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college ...
*Sunday, July 14, 2013 at 1:03am*

**statistics**

A physician routinely makes physical examinations of children. She is concerned that a three-year-old girl has a height of only 87.8 cm. Heights of three-year-old girls have a mean of 97.5 cm and a standard deviation of 6.9 cm (based on data from the National Health and ...
*Saturday, July 13, 2013 at 10:29pm*

**statistics**

Playing game of chance and pay 300 by rolling a fair die one time if you rome a 2 and receive $1300 if you roll a 4 or six you receive $900 if you ore a 3 5 or 9 receive nothing. find expected value for this game. based on value is it a good game to play?
*Saturday, July 13, 2013 at 12:19am*

**statistics**

participant on tv show picke from lage # applicants with equal number of men and woman .amongst the last 9 participant 7 have been women . if they are picked randomly what is the probability of geting 7 more women when 9 people are picked
*Saturday, July 13, 2013 at 12:16am*

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