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April 19, 2014

April 19, 2014

**Recent Homework Questions About Statistics**

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**Business Statistics**

28.5, 44.5
*Saturday, March 29, 2014 at 11:06am*

**Statistics**

These are the answers that I get to chose from. A. 0.7433. B. 0.8643. C. 0.1357. D. 0.
*Saturday, March 29, 2014 at 10:02am*

**Statistics**

X = 100 + 15(.33) = 105.0
*Friday, March 28, 2014 at 3:35pm*

**Statistics**

you can do lots of Z table stuff here: http://davidmlane.com/hyperstat/z_table.html
*Friday, March 28, 2014 at 3:20pm*

**Statistics**

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ score separating the top 37% from the others. Answer in one decimal place.
*Friday, March 28, 2014 at 3:09pm*

**Statistics**

Thank you
*Friday, March 28, 2014 at 12:01am*

**Statistics**

mean = (4,253+ 5,578 +6,406+ 7,334+ 8,728 + 11,298 +15,182)/ 7
*Thursday, March 27, 2014 at 11:54pm*

**Statistics**

For the most recent seven years, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,253; 5,578; 6,406; 7,334; 8,728; 11,298; 15,182. What is the annual arithmetic mean number of degrees awarded? About 9,120 ...
*Thursday, March 27, 2014 at 11:50pm*

**Statistics**

About 8,397
*Thursday, March 27, 2014 at 11:49pm*

**Statistics**

Thank you! That is a lot of help!!
*Thursday, March 27, 2014 at 11:46pm*

**Statistics**

IQ = Q3 - Q1 IQR = 72-25 = 47
*Thursday, March 27, 2014 at 11:45pm*

**Statistics**

8.Using the following statistics to describe a distribution of data, what is the interquartile range? Minimum = 13 Q1 = 25 Median = 54 Q3 = 72 Maximum = 98 25. 12. 85. 47.
*Thursday, March 27, 2014 at 11:26pm*

**Statistics**

For the most recent seven years, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,253; 5,578; 6,406; 7,334; 8,728; 11,298; 15,182. What is the annual arithmetic mean number of degrees awarded? About 9,120 ...
*Thursday, March 27, 2014 at 10:11pm*

**Statistics**

Thank you so much!!!
*Thursday, March 27, 2014 at 10:11pm*

**Statistics**

(50*100 + 100*27.20+ 20*12.20)/(50+ 100+20) = $7964/170 = $46.85
*Thursday, March 27, 2014 at 9:58pm*

**Economics and Statistics**

(50*100 + 100*27.20+ 20*12.20)/(50+ 100+20) = $7964/170 = $46.85
*Thursday, March 27, 2014 at 9:55pm*

**Statistics**

Thanks again!!
*Thursday, March 27, 2014 at 9:49pm*

**Statistics**

A stockbroker placed the following order for a customer: • 50 shares of Kaiser Aluminum preferred at $100 a share • 100 shares of GTE preferred at $27.20 a share • 20 shares of Boston Edison preferred at $12.20 a share What is the weighted arithmetic mean price ...
*Thursday, March 27, 2014 at 9:49pm*

**Statistics**

(11.0-2.0, 11.0+ 2.0) (9.0 , 13.0) 9.0 and 13.0 inches
*Thursday, March 27, 2014 at 9:42pm*

**Statistics**

The distribution of a sample of the outside diameters of PVC gas pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 11.0 inches, and the standard deviation is 2.0 inches. About 68 percent of the outside diameters lie between what two amounts? 8....
*Thursday, March 27, 2014 at 9:10pm*

**Statistics**

Thank you
*Thursday, March 27, 2014 at 9:08pm*

**Statistics**

Range= highest value -lowest value Range = $145 - $132 = $13
*Thursday, March 27, 2014 at 9:02pm*

**Economics and Statistics**

(50*100 + 100*27.20+ 20*12.20)/(50+ 100+20) = $7964/170 = $46.85
*Thursday, March 27, 2014 at 8:59pm*

**statistics**

An airline company is considering a new policy of booking as many as 161 persons on an airplane that can seat only 140. (Past studies have revealed that only 81% of the booked passengers actually arrive for the flight.) Estimate the probability that if the company books 161 ...
*Thursday, March 27, 2014 at 8:51pm*

**Statistics**

The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $143, $138, $132, $136, $145 and $136. What is the range? $24 $9 $13 $0
*Thursday, March 27, 2014 at 8:49pm*

**Economics and Statistics**

A stockbroker placed the following order for a customer: • 50 shares of Kaiser Aluminum preferred at $100 a share • 100 shares of GTE preferred at $27.20 a share • 20 shares of Boston Edison preferred at $12.20 a share What is the weighted arithmetic mean price ...
*Thursday, March 27, 2014 at 8:07pm*

**Statistics**

Use a formula to find sample size. Here is one: n = [(z-value * sd)/E]^2 ...where n = sample size, z-value = 1.96 for 95% confidence, sd = 15.2, E = 3.5, ^2 means squared, and * means to multiply. Plug the values into the formula and finish the calculations. Round your answers...
*Thursday, March 27, 2014 at 6:14pm*

**Business Statistics**

First, arrange them in numerical order. 27, 29, 29, 41, 49, 59, 64, 79 The median number is the one in the middle. Since this set has two middle numbers (41, 49), the median is the average of those two numbers: 45
*Thursday, March 27, 2014 at 5:23pm*

**Business Statistics**

What is the median of 29, 49, 27, 64, 79, 59, 29 and 41? 29.0 45.0 59.5 49.0
*Thursday, March 27, 2014 at 5:02pm*

**statistics**

help
*Thursday, March 27, 2014 at 2:10pm*

**probability and statistics**

xvxc
*Thursday, March 27, 2014 at 12:25pm*

**statistics**

9 people probability of man first = 5/9 then prob of woman = 4/8 so 20/72 for man then woman then probability of woman first = 4/9 then prob of man = 5/8 so 20/72 again add them 40/72 = .55
*Thursday, March 27, 2014 at 11:27am*

**statistics**

A committee consists of five men and four women. Two people are selected at random from the committee. What is the probability that one man and one woman will be selected?
*Thursday, March 27, 2014 at 11:13am*

**statistics**

345
*Thursday, March 27, 2014 at 9:38am*

**statistics**

Not Sure
*Thursday, March 27, 2014 at 3:08am*

**statistics**

64
*Wednesday, March 26, 2014 at 11:14pm*

**Statistics**

A population has a standard deviation of 15.2. How large a sample must be drawn so that a 95% confidence interval for the population mean will have a margin error equal to 3.5?
*Wednesday, March 26, 2014 at 9:37pm*

**`Statistics**

A public relations firm found only 9% of voters in a certain state are satisfied with their US senators. How large a sample of voters should be drawn so that the sample proportion of voters who are satisfied with their senators is approximately normally distributed?
*Wednesday, March 26, 2014 at 9:36pm*

**Statistics**

kjjn
*Wednesday, March 26, 2014 at 9:15pm*

**Statistics**

4
*Wednesday, March 26, 2014 at 9:12pm*

**statistics**

1
*Wednesday, March 26, 2014 at 6:56pm*

**statistics**

18 + 24 = 42 first black sock = 24/42 second black sock = 23/41 product = 24/42 * 23/41 = .321
*Wednesday, March 26, 2014 at 6:07pm*

**statistics**

If there are 18 blue socks and 24 black socks what is the probability of pulling out 2 black socks?
*Wednesday, March 26, 2014 at 5:39pm*

**statistics**

.4987 .4988
*Tuesday, March 25, 2014 at 11:56pm*

**Business Statistics**

10
*Tuesday, March 25, 2014 at 11:06pm*

**Statistics**

you can play around with Z table stuff here: http://davidmlane.com/hyperstat/z_table.html
*Tuesday, March 25, 2014 at 11:36am*

**statistics??**

.
*Tuesday, March 25, 2014 at 7:52am*

**Statistics**

2.0285
*Monday, March 24, 2014 at 10:11pm*

**Math-Statistics**

Assume you build a Candy castle for which you buy a bag of gummy bears, a block of chocolate and a bag of nuts. The weight of the three ingredients is a random variable (X1, X2 and X3) with mean weights μ1 = 200 gram, μ2 = 400 gram and μ3 = 150 gram. The bags ...
*Monday, March 24, 2014 at 7:26pm*

**Math-Statistics**

The chance that a college student has a job offer before graduation is 70%. If I sample 200 graduates… (use continuity correction) a) what is the chance more than 130 of them have a job offer? b) what is the chance less than 133 of them have a job offer? c) what is the ...
*Monday, March 24, 2014 at 7:25pm*

**Math-Statistics**

5) You know that you will inherit 20% of your uncle John’s wealth, 30% of your aunt Becky’s wealth and 50% of your parent’s wealth. Since they are not dead yet, their respective wealth is a RV and all we know is that their wealth at death is ~N and independent ...
*Monday, March 24, 2014 at 7:25pm*

**Math-Statistics**

Assume your expected lifetime income is $1.5 million and the standard deviation is $250,000. a) What is the chance that you will earn more than $1.1 million during your lifetime? b) What is the chance that you will earn less than $2 million during your lifetime? c) What is the...
*Monday, March 24, 2014 at 7:23pm*

**statistics**

0.028
*Monday, March 24, 2014 at 2:32pm*

**stats**

Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.15) and its Z score. Insert all values in above equation to calculate the score.
*Monday, March 24, 2014 at 1:20pm*

**Statistics (?)**

Find the mean 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 95% = mean ± ...
*Monday, March 24, 2014 at 1:18pm*

**statistics**

Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.10) and its Z score. Insert ±Z into equation above and solve for score.
*Monday, March 24, 2014 at 1:13pm*

**Speech- Statistic needed**

Try these. http://www.google.com/webhp?source=search_app#q=u.s.+volunteers+disaster+relief++statistics
*Monday, March 24, 2014 at 12:22pm*

**Speech- Statistic needed**

Does anyone know of any websites that have statistics on the number of people that volunteer for disaster relief in the us?
*Monday, March 24, 2014 at 12:13pm*

**statistics**

help i do not understand how to solve this question: assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be ...
*Monday, March 24, 2014 at 11:31am*

**Statistics **

Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 95% ...
*Monday, March 24, 2014 at 8:34am*

**college statistics**

Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 95% ...
*Monday, March 24, 2014 at 8:33am*

**statistics**

the central 80% of the Z table lies within µ ± 1.282σ So, plug in your numbers You can play around with Z table stuff at this excellent site: http://davidmlane.com/hyperstat/z_table.html
*Monday, March 24, 2014 at 5:09am*

**statistics**

assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be the upper and lower readings to qualify people to ...
*Monday, March 24, 2014 at 2:59am*

**statistics**

You do not mention what is being measured. Do the numbers represent SAT Scores or the number of people who took the test (participation rates)? Points on a scatter diagram are each represented by two numbers, one on the ordinate (Y axis) and the other on the abscissa (X axis...
*Sunday, March 23, 2014 at 10:03pm*

**statistics**

a. SE = 50/sqrt(15000) * sqrt((60000-15000)/60000-1))
*Sunday, March 23, 2014 at 7:02pm*

**Statistics**

The following is a list of 13 measurements: -38,-89,-47,-43,-70,59,92,97,23,-11,-62,-22,-5. Suppose that these measurements are respectively labeled X1,X2,...,X13 Find the sum when i=1 Xi/30.
*Sunday, March 23, 2014 at 6:55pm*

**Statistics**

a. 25.4 -+ 1.96 * 2.4 /sqrt((90)) b. 25.4 -+ 1.645 * 2.4 /sqrt((90)) c. 25.4 -+ 2.575 * 2.4 /sqrt((90))
*Sunday, March 23, 2014 at 6:40pm*

**statistics**

2,3,4,5
*Sunday, March 23, 2014 at 1:26pm*

**statistics**

the answer is wrong...
*Sunday, March 23, 2014 at 12:28pm*

**Statistics**

99% = µ±2.576 std
*Sunday, March 23, 2014 at 11:56am*

**statistics**

2, 3
*Sunday, March 23, 2014 at 10:14am*

**Statistics**

)The random sample shown below was selected from a normal distribution Complete parts (a) and (b). Construct a 99% confidence interval for the population mean u. Round to two decimal places as needed.
*Sunday, March 23, 2014 at 9:34am*

**Statistics**

A random sample of 90 observations produced a mean that = 25.9 and a standard deviation s =2.4 (a)Find a 95% confidence interval for u (b)Find a 90% confidence interval for u (c)Find a 99% confidence interval for u (Use integers or decimals for any number in the expression. ...
*Sunday, March 23, 2014 at 9:30am*

**statistics**

(12) Suppose N – 60,000, n =15,000, and s =50 (a) compute the standard error of mean (x) using the finite population correction factor (b) Repeat part a assuming n =30,000 (c)Repeat part a assuming n = 60,000 (d)Compare parts (a), (b), and (c), and describe what happens ...
*Sunday, March 23, 2014 at 9:25am*

**statistics**

5. Suppose a manufacturer of computer chips is experiencing an average of 2% defective chips. (a) If a lot contains 1000 chips, what is the probability that more than 25 chips are defective? HINT. Use the normal approximation to the binomial.
*Sunday, March 23, 2014 at 12:35am*

**statistics**

The highest point in the scatter is the point for Illinois, at 1807. The two just below it, at 1778 and 1777, are for Minnesota and Iowa. The lowest points are at 1391 and 1385, for Maine and D.C. respectively. Pick all the options that are correct. The scatter diagram shows ...
*Saturday, March 22, 2014 at 3:47pm*

**statistics**

opinion polls find that 16 percent of americans adults claim that they never have time to relax. suppose you take a random sample of 400 american adults and count the number X in your sample and claim that they never never have time to relax.
*Saturday, March 22, 2014 at 12:02pm*

**statistics**

Z = (x -26)/2.4 1.55 = (x-26)/2.4 1.55(2.4) = x -26 1.55(2.4) + 26 = x
*Friday, March 21, 2014 at 11:07pm*

**statistics**

z = (98.5-98.6)/.74/sqr(100) z = (98.7- 98.6)/.74/sqr(100)
*Friday, March 21, 2014 at 10:46pm*

**statistics**

(20 C 10) (.45)^10 * (.55)^10
*Friday, March 21, 2014 at 10:42pm*

**statistics**

Consider a binomial experiment with 20 trials and a probability of 0.45 on a single trial.Use the normal distribution to find the probability of exactly 10 successes.
*Friday, March 21, 2014 at 10:18pm*

**statistics**

Suppose the average body temp is 98.6 assume the variable is normally distributed with a standard deviation of .74 degrees. suppose a sample of 100 is taken. what is the probability that the mean is below 98.4??? Between 98.5 AND 98.7??
*Friday, March 21, 2014 at 7:28pm*

**statistics**

the average act score submitted to a certain university is 26. to be eligible for admission, a student must score in the top 6% of applicants. if the scores are normally distributed with a standard deviation of 2.4, what is the minimum score needed to be considered for admission?
*Friday, March 21, 2014 at 7:25pm*

**Statistics**

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)/...
*Friday, March 21, 2014 at 1:35pm*

**Statistics**

An instructor hy pothesizes that the mean of the final ex am grades in her statistics class is larger for the male students than that it is for the female students. The data from the final ex am for the last semester are presented here. Test her claim using = 0.05. ...
*Friday, March 21, 2014 at 8:27am*

**Statistics**

0.833 grams per mm is correct: slope=rsd(y)/sd(x)=0.75*0.5/0.45 slope is 0.8333 grams per mm The intercept of the regression line for estimating chick weight based on egg diameter is Intercept=mean y - slope *mean x Intercept = 23 - 0.8333* 6 = 18
*Friday, March 21, 2014 at 6:09am*

**statistics**

Standard deviation = √npq = √[(400)(.5)(.5)] = √(100) = 10 Note: n = sample size, p = .5, q = .5
*Thursday, March 20, 2014 at 5:39pm*

**Math: Statistics Least squares line**

Your least squares line looks okay. Now, to find the ?, use 7 for y in the equation and solve for x. That will be the value you seek. Here's how the equation would look: 7 = .01764x + .00693 I hope this helps.
*Thursday, March 20, 2014 at 5:31pm*

**statistics**

Here's one way to do this problem: n = 8 p = .80 q = 1 - p = 1 - .80 = .20 You will need to find P(7) and P(8). Add those values together, then subtract from 1. This will be your probability. You can use a binomial probability table, or calculate by hand using the ...
*Thursday, March 20, 2014 at 5:21pm*

**Statistics **

1. A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows: Eating Habits Scores Baseball Players Football Players Basketball Players 34 27 35 18 28 ...
*Thursday, March 20, 2014 at 4:20pm*

**statistics**

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.071) and its Z score. OR… http://davidmlane.com/hyperstat/z_table.html
*Thursday, March 20, 2014 at 1:32pm*

**statistics**

From experience, an airline knows that only 80% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that fewer than 7 of them show up.
*Thursday, March 20, 2014 at 11:57am*

**Math: Statistics Least squares line**

Find an equation of the least squares line, then use it to complete the table. X- 111 169 230 287 335 ? Y- 2 3 4 5 6 7 Extrapolation I missed the lesson on this and as far as I can tell I think the least squares line is y= .01764x+ .oo693 If anyone could verify my line and and...
*Wednesday, March 19, 2014 at 11:59pm*

**statistics**

If boys and girls are equally likely and groups 400 births are randomly selected find the standard deviation
*Wednesday, March 19, 2014 at 11:19pm*

**statistics**

Find z such that 7.1% of the standard normal curve lies to the left of z ?
*Wednesday, March 19, 2014 at 10:47pm*

**Statistics**

2
*Wednesday, March 19, 2014 at 8:29pm*

**Statistics**

(52!)/(5!47!) or 52C5 = 2,598,960 different ways a 5-card hand can be dealt from a deck of 52 cards. (4C1)x(48C4) = the amount containing at most one ace. (5C4)x(47C1) = amount containing cards of all four suits. (not very sure of this answer)
*Wednesday, March 19, 2014 at 3:40pm*

**Statistics PLEASE HELP FINAL IN 1 HOUR**

Is a new hair shampoo product actually effective? Ask participants to grade themselves on scale of 1-10 how attractive their hair is both before and after using a shampoo product after 2 weeks Results Subject Initial Rating (A) Rating After 2 Weeks (B) 1 1 5 2 2 3 3 5 5 4 3 7 ...
*Wednesday, March 19, 2014 at 2:24pm*

**statistics**

99% of men scored between -52.68 ,64.64 where did 95% of the values for weight relative to the ideal lie?
*Wednesday, March 19, 2014 at 1:43pm*

**Statistics**

95% = mean ± 1.96 SEm SEm = SD/√n I'll let you do the calculations.
*Wednesday, March 19, 2014 at 1:20pm*

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