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April 23, 2014

April 23, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**statistics**

The average age for licensed drivers in a county is µ= 42.6, σ= 12 and the distribution is approximately normal. A county police officer was interested in whether the average age of those receiving parking tickets in the county differed from that of the average age ...
*Saturday, April 19, 2014 at 6:59pm*

**English Composition**

Ms. Sue is right. You need to discuss these kinds of things with your parents. Children and teens that go missing each year is only one of the circumstances that your parents might be thinking of, but undoubtedly there are others. Stats on missing kids, in case you want to use...
*Saturday, April 19, 2014 at 5:05pm*

**statistics**

Z = (score-mean)/SEm SEm = SD/√n Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
*Saturday, April 19, 2014 at 1:15pm*

**statistics**

Ho: µ = sample mean
*Saturday, April 19, 2014 at 1:00pm*

**statistics**

Z = (score-mean)/SD Insert the known values and solve for the unknown.
*Saturday, April 19, 2014 at 12:58pm*

**statistics**

Scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation of 10 points. A sample of 36 exam scores was selected from UCA with a mean score of 58 points. Using a significance level of 0.01, determine whether scores on ...
*Friday, April 18, 2014 at 8:49pm*

**statistics**

The mean score for all individuals who took the Law School Admission Test (LSAT) in 2010 was 155 and the standard deviation was 7. 9. What is the z score for a person, who received an LSAT score of 167? a. +1.71 b. +1.64 c. +1.74 d. -1.71 10.What is the raw score for a person ...
*Friday, April 18, 2014 at 8:42pm*

**Stats**

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of Z = -1.77. Is the probability in the smaller area < .05?
*Friday, April 18, 2014 at 12:59pm*

**Statistics**

http://drdavespsychologypage.homestead.com/Two___Two_____four.pdf
*Friday, April 18, 2014 at 12:55pm*

**statistics**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. both even number = 3/6 * 3/6 = ? both odd = same different = 1/6 * 5/6 = ?
*Friday, April 18, 2014 at 12:54pm*

**statistics (?)**

What follows? You cannot copy and paste here.
*Friday, April 18, 2014 at 12:51pm*

**Statistics**

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.05) = Z = 1.645 90% = mean ± 1.645 SEm SEm = SD/√n
*Friday, April 18, 2014 at 12:11pm*

**Statistics**

A random sample of 47 students studied for an average of 7.1 hours last week. If the population standard deviation is 1.2 hours, what is the 90% confidence interval for the population mean?
*Friday, April 18, 2014 at 11:19am*

**Statistics **

A sample of 50 homes in a subdivision revealed that 24 were ranch style. a) Construct a 98 percent confidence interval for the true proportion of ranch-style homes b) Check the normaility assumption.
*Friday, April 18, 2014 at 9:57am*

**statistics**

in throwing two dice find the probability ofcoming even number on both probability of coming odd number on dice probability of different number on both dice
*Friday, April 18, 2014 at 9:24am*

**statistics**

a box contain five silp of paper marked 1,2,3,4and5 tow silp are selected without replacement,list the possible vaule for each of following random variable the sum of two number on two silp the difference between the first and second number
*Friday, April 18, 2014 at 9:17am*

**Statistics**

Hi, Are market returns (with numbers such as -3.45, 4, 2.456 representing the "returns") ordinal or nominal data? Thanks!
*Friday, April 18, 2014 at 1:40am*

**Statistics**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See your previous post.
*Thursday, April 17, 2014 at 3:00pm*

**statistics**

11, 12. A statistic is a measure on a sample, while a parameter is a measure on a population. 13. SEm = SD/√n = SEm = 12/√75 = ? 14, 15. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the ...
*Thursday, April 17, 2014 at 2:58pm*

**Statistics Emergency please**

You're welcome
*Thursday, April 17, 2014 at 1:50pm*

**Statistics Emergency please**

Thanks for your help I really appreciate it.
*Thursday, April 17, 2014 at 1:45pm*

**Statistics Emergency please**

a. µ = np = 540(.12) = 64.8 σ = √(.12*.88/540) = 0.014 z = 0.03/0.014 = 2.14 z = -0.03/0.014 = -2.14 P(-2.14 < z < 2.14) =0.9676 b. µ = np = 540(.12) = 64.8 σ = √(.12*.88/540) = 0.014 z = 0.015/0.014 = 1.07 z = -0.015/0.014 = -1.07 P(-1....
*Thursday, April 17, 2014 at 1:39pm*

**Statistics Emergency please**

People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a)What is the probability ...
*Thursday, April 17, 2014 at 1:17pm*

**Statistics Emergency please**

The sample distribution of p-bar σp = √0.12*0.88/540) = 0.014
*Thursday, April 17, 2014 at 12:47pm*

**Statistics Emergency please**

People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a.Show the sampling ...
*Thursday, April 17, 2014 at 12:34pm*

**Language Arts**

Read the following sentence from the editorial: "We learn that all of our moments can be filled with joy if we only open our hearts to our pets." How is faulty reasoning shown in this sentence? A. The author exaggerates the effect of owning a pet. B. The author makes...
*Thursday, April 17, 2014 at 11:09am*

**statistics**

what is .8^3 = ?
*Thursday, April 17, 2014 at 9:16am*

**statistics**

According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that all of them enjoy drinking beer is:
*Thursday, April 17, 2014 at 12:27am*

**statistics**

Yes, I understand how you worked out the mean. I understand about the 12 above and below the mean, but how did you arrive at 12 = 2 standard deviation points.
*Wednesday, April 16, 2014 at 11:21pm*

**Statistics**

idk
*Wednesday, April 16, 2014 at 8:36pm*

**Statistics**

paired test hard
*Wednesday, April 16, 2014 at 7:51pm*

**statistics**

A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
*Wednesday, April 16, 2014 at 7:48pm*

**Statistics**

Type I errors result when you reject the null and it's true. Type II errors result when you accept the null and it's false. If you reject the null hypothesis that the subject is guessing and it's true, you have made a Type I error. If you accept the null that the ...
*Wednesday, April 16, 2014 at 5:38pm*

**Statistics**

People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a.Show the sampling ...
*Wednesday, April 16, 2014 at 5:05pm*

**Statistics**

The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample of 90 test takers will...
*Wednesday, April 16, 2014 at 5:04pm*

**Statistics**

Their admission of speeding. An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable. A dependent variable is the response or measure of results.
*Wednesday, April 16, 2014 at 2:34pm*

**statistics**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
*Wednesday, April 16, 2014 at 2:30pm*

**statistics**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See your later post.
*Wednesday, April 16, 2014 at 2:29pm*

**Statistics**

A survey asked 2000 people whether or not they frequently exceed the speed limit. The collected data is summarized in the following contingency table. The goal is to determine if there is a difference in the population proportion that say “yes” when comparing those ...
*Wednesday, April 16, 2014 at 2:24pm*

**statistics**

Z = (score-mean)/SD Fill in the known values and solve for the unknown.
*Wednesday, April 16, 2014 at 2:19pm*

**statistics**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. A statistic is a measure on a sample, while a parameter is a measure on a ...
*Wednesday, April 16, 2014 at 2:17pm*

**statistics**

SEm = SD/√n 10 = ± Z (SEm) Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
*Wednesday, April 16, 2014 at 2:12pm*

**statistics**

A statistic is a measure on a sample, while a parameter is a measure on the whole population.
*Wednesday, April 16, 2014 at 2:05pm*

**statistics**

0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05
*Wednesday, April 16, 2014 at 2:03pm*

**statistics**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. Find table in the back of your statistics text labeled something like "...
*Wednesday, April 16, 2014 at 2:01pm*

**Statistics**

An ESP experiment is done in which a participant guesses which of 8 cards the researcher has randomly picked, where each card is equally likely to be selected. This is repeated for 200 trials. The null hypothesis is that the subject is guessing, while the alternative is that ...
*Wednesday, April 16, 2014 at 12:20pm*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Wednesday, April 16, 2014 at 11:04am*

**statistics**

The Good Mental Health Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability ...
*Wednesday, April 16, 2014 at 8:49am*

**statistics**

A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
*Wednesday, April 16, 2014 at 8:37am*

**statistics**

10/ √(50) = 1.4142 b. The population size is N = 50,000 (to 2 decimals). 1.4142 √ [ (N-1)/(N-n)] (1.4142)√ [49,999/ 49,950] ) =1.41 c. The population size is N = 5000 (to 2 decimals). 1.4142 √ ( 4999/4950) ) = 1.42 d. The population size is N = 500 (to...
*Wednesday, April 16, 2014 at 12:29am*

**statistics**

The total number = 409 + 299 + 291 = 999 A) 409/999 = 0.4094 or 0.41 B) 299/999 = 0.2993 or 0.30 C) 291/999 = 0.2913 or = 0.29
*Tuesday, April 15, 2014 at 10:38pm*

**statistics**

People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a.Show the sampling ...
*Tuesday, April 15, 2014 at 10:06pm*

**statistics**

The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample of 90 test takers will...
*Tuesday, April 15, 2014 at 10:02pm*

**statistics**

Suppose a random sample of size 50 is selected from a population with σ = 10. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is infinite (to 2 decimals). ...
*Tuesday, April 15, 2014 at 10:00pm*

**statistics**

The American Association of Individual Investors (AAII) polls its subscribers on a weekly basis to determine the number who are bullish, bearish, or neutral on the short-term prospects for the stock market. Their findings for the week ending March 2, 2006, are consistent with ...
*Tuesday, April 15, 2014 at 9:59pm*

**statistics**

a,c
*Tuesday, April 15, 2014 at 8:02pm*

**statistics**

A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
*Tuesday, April 15, 2014 at 7:17pm*

**statistics**

The mean score for all individuals who took the Law School Admission Test (LSAT) in 2010 was 155 and the standard deviation was 7. What is the z score for a person, who received an LSAT score of 167? a. +1.71 b. +1.64 c. +1.74 d. -1.71 What is the raw score for a person with a...
*Tuesday, April 15, 2014 at 6:48pm*

**statistics**

The Good Mental Health Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability ...
*Tuesday, April 15, 2014 at 4:39pm*

**statistics**

A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
*Tuesday, April 15, 2014 at 4:21pm*

**Statistics**

Look up the Z score on that table. You are looking for probability of Z score less than (<) -1.45. You could also try: http://davidmlane.com/hyperstat/z_table.html
*Tuesday, April 15, 2014 at 2:54pm*

**statistics (?)**

Insufficient data.
*Tuesday, April 15, 2014 at 2:48pm*

**statistics**

a. Z = (score-mean)/SEm SEm = SD/√n Solve Z for scores of 502±10. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between mean and Z scores. b and c. Use similar ...
*Tuesday, April 15, 2014 at 2:46pm*

**statistics**

A negative Z score does not necessarily indicate anemia. It would have to be significantly low, P < .05, Z < -1.96, to be considered anemic.
*Tuesday, April 15, 2014 at 2:08pm*

**statistics**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See your later post.
*Tuesday, April 15, 2014 at 2:03pm*

**statistics**

90% confidence interval leaves .05 on each side. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.05) and its Z score. 90% = mean ± 1.645 SEm SEm = SD/√n
*Tuesday, April 15, 2014 at 1:59pm*

**statistics**

99% = mean ± 2.575 SEm SEm = SD/√n "mean for this group" = sample mean
*Tuesday, April 15, 2014 at 1:50pm*

**statistic**

Find the means first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = square root of variance Z = (mean1 - mean2)/...
*Tuesday, April 15, 2014 at 1:39pm*

**Statistics**

Do I have to subtract that number from 1? That's really the part I can't remember...there's some time when you leave it alone and another when you subtract from 1...?
*Tuesday, April 15, 2014 at 1:36pm*

**Statistics**

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
*Tuesday, April 15, 2014 at 1:35pm*

**Statistics**

Find the indicated probability using the standard normal distribution: P(z<-1.45)
*Tuesday, April 15, 2014 at 1:29pm*

**statistic**

Listed below are the ages of actresses and actors at the times that they won Oscars for the categories of Best Actress and Best Actor. The ages are listed in chronological order by row, so that corresponding locations in the two tables are from the same year. (Notes: In 1968 ...
*Tuesday, April 15, 2014 at 1:10pm*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Tuesday, April 15, 2014 at 12:59pm*

**statistics**

c
*Tuesday, April 15, 2014 at 12:05pm*

**statistics**

A manufacturer ships toasters in cartons of 50. In each carton, they estimate a 2% chance that one of the toasters will need to be sent back for minor repairs. In a batch of 25,000 toasters, what are the chances that fewer than 475 need to be returned? The probability that ...
*Tuesday, April 15, 2014 at 12:02pm*

**Statistics PLEASE HELP ME!**

Jim Tree pays for shipping on the basis of weight. He knows weight is normally distributed so he can use the standard normal distribution. He decides to weigh 1,000 randomly trees in his shipment. Next, he calculates the mean and standard deviation of their weights. He finds ...
*Tuesday, April 15, 2014 at 10:54am*

**statistics**

78
*Tuesday, April 15, 2014 at 10:54am*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Tuesday, April 15, 2014 at 10:24am*

**health insurance**

Health insurance statistics strengths and weaknessess
*Tuesday, April 15, 2014 at 10:07am*

**statistics**

Jim Tree sells Christmas trees. The mean length of the trees purchased was 68 inches with a standard deviation of 10 inches. Jim wants to know what per cent of his sales were more than 84 inches tall. He can use the standard normal distribution to help him.
*Tuesday, April 15, 2014 at 9:42am*

**statistics**

Jim Tree sells Christmas trees. The mean length of the trees purchased was 68 inches with a standard deviation of 10 inches. Jim wants to know what per cent of his sales were more than 84 inches tall. He can use the standard normal distribution to help him.
*Tuesday, April 15, 2014 at 9:29am*

**statistics**

same webpage ... click on "between" and enter -3 and 3 to get .9973 choose you matching answer.
*Tuesday, April 15, 2014 at 8:38am*

**statistics**

Use either your tables available to your or use http://davidmlane.com/hyperstat/z_table.html to get .9772 or .98 from your choices
*Tuesday, April 15, 2014 at 8:37am*

**statistics**

Which of the following percentiles corresponds to the area beneath the standard normal curve from a z score of-3.00 to + 3.00? a. 98% b. 100% c. 95% d. 99.7%
*Tuesday, April 15, 2014 at 8:33am*

**statistics**

Jorge finds that his standardized z score on an IQ is 2.0. What percentage of people did he score higher than? a. 98 b. 96 c. 68 d. 34
*Tuesday, April 15, 2014 at 8:31am*

**Statistics**

The yearly returns of a stock are normally distributed with a mean of 5.1% and standard deviation of 2.7%. Find the probability of a yearly return being greater than 6%.
*Tuesday, April 15, 2014 at 6:18am*

**Statistics**

0.2
*Tuesday, April 15, 2014 at 6:05am*

**statistics**

well, who has a negative z score?
*Tuesday, April 15, 2014 at 12:27am*

**statistics**

C
*Tuesday, April 15, 2014 at 12:26am*

**Statistics**

mean
*Tuesday, April 15, 2014 at 12:10am*

**statistics**

Professor Smith gave a final exam in her history class. The scores on the final exam are normally distributed with a mean of 75 and a standard deviation of 6. If Professor Smith wishes to give A’s to the top 4%, what would be the cutoff score be for A’s? a. 90.0 b. ...
*Monday, April 14, 2014 at 11:25pm*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Monday, April 14, 2014 at 11:18pm*

**statistics**

z-score for chemistry = (82-75)/6.25 = 1.12 z-score for physics = (63-59)/3.57 = 1.12044 I would consider the difference insignificant, so the two scores would be equivalent.
*Monday, April 14, 2014 at 11:00pm*

**statistics**

Ashley and Sanjay are donating blood at a local hospital. As a standard practice, the blood is screened for anemia (low levels of red blood cells), and the results are given to each donor as a z score, ranging from negative scores (low amounts of red blood cells, anemic) to ...
*Monday, April 14, 2014 at 10:49pm*

**statistics**

Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should Leslie get...
*Monday, April 14, 2014 at 10:27pm*

**statistics**

Standard error of the proportion is: √(pq/n) p = .55 q = 1-p = .45 n = sample size I'll let you take it from here.
*Monday, April 14, 2014 at 5:41pm*

**statistics**

Some notes on finite population correction factor: If the population is small and the sample is large (more than 5% of the small population), use the finite population correction factor. For standard error of the mean, use: sd/√n If you need to adjust for the finite ...
*Monday, April 14, 2014 at 5:32pm*

**statistics**

People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. Show the sampling ...
*Monday, April 14, 2014 at 5:17pm*

**statistics**

Assume that the population proportion is .55. Compute the standard error of the proportion, ( ), for sample sizes of 100, 200, 500, and 1000 (to 4 decimals). a. 100? b. 200? c. 500? d. 1000?
*Monday, April 14, 2014 at 5:16pm*

**statistics**

The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample of 90 test takers will...
*Monday, April 14, 2014 at 5:15pm*

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