Friday

August 1, 2014

August 1, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**statistics**

Conduct a chi square analysis to determine whether sex and year in college are related. I have tried to submit the data but I can't seem to make the submission work. For my data I used 20 males and 20 females. and for the year in college I have 10 freshman, 10 sophomore, ...
*Thursday, July 31, 2014 at 10:53pm*

**statistics**

The following list is a sampling of the costs of various statistics textbooks used at several colleges. Give the upper confidence limit for a 95% confidence interval estimate for the mean cost of all statistics textbooks. 109.95; 92.00; 96.70; 84.85; 92.60; 84.45; 90.95; 77.00...
*Thursday, July 31, 2014 at 6:12pm*

**Statistics**

In hypothesis testing, as the a level gets smaller, the level of confidence increases. True or False? And why or why not?
*Wednesday, July 30, 2014 at 7:48pm*

**statistics**

In order to subject their cash registers to random audit, suppose we want to select a random sample of three people from this group of cashiers. Bonita, Chandra, Earl, Glenda, Homer, Jamal, Kendra, Maria, Oscar, Reshonda. How do I use a random number table?
*Wednesday, July 30, 2014 at 9:00am*

**statistics**

A researcher wishes to estimate the proportion of adults living in rural areas who own a gun. He wishes to achieve a margin of error of 2.8%. What is the minimum sample size needed?
*Monday, July 28, 2014 at 1:34am*

**statistics**

The distribution of students’ heights in a class of 100 students is normal, with a mean height of 66 inches and a standard deviation of three. With these parameters, answer the associated question(s). The shortest 10% of the class is equal to or shorter than __________ ...
*Sunday, July 27, 2014 at 9:43pm*

**statistics**

A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male smokers and female smokers are equal...
*Sunday, July 27, 2014 at 4:21pm*

**Statistics**

How would I solve each system by substitution? I know basically what to do, but I keep getting stuck. Thanks! 1)x=2-y 3x-2y=1 2)2x+3y=-1 x=y-13
*Sunday, July 27, 2014 at 2:46pm*

**Statistics**

I need some help on how to write constraints. For example, I don't get how to do these problems and write a constraint for them: 1) A food store owner buys turkeys and hams. The owner plans to purchase at most a total of 50 products. Write a constraint. 2) The food store ...
*Sunday, July 27, 2014 at 2:42pm*

**Statistics**

Express the confidence interval (0.033,0.099) in the form of P-E<p<P+E
*Sunday, July 27, 2014 at 12:13pm*

**Statistics**

Express the confidence interval (0.033,0.099) in the form of P-E<p<P+E
*Sunday, July 27, 2014 at 11:59am*

**statistics**

Scores for men on the verbal portion of the SAT-1 test are normally distributed with a mean of 509 and a standard deviation of 112. If a man is randomly selected, find the probablity tht his score is at least 571
*Thursday, July 24, 2014 at 3:55pm*

**Statistics**

Do you drink the recommended amount of water each day? Most Americans don't! On average, Americans drink 5.4 eight-oz servings of water a day. A sample of 36 education professionals was randomly selected and their water consumption for a 24-hour period was monitored; the ...
*Wednesday, July 23, 2014 at 8:27am*

**Statistics**

Express the confidence interval using the indicated format. Express the confidence interval -0.129 < p < 0.631 in the form of p ± E.
*Monday, July 21, 2014 at 7:14pm*

**Statistics**

Blood samples from 10 persons were sent to each of two labs for cholesterol determination. The measurements are recorded below: Table 1. Serum Cholesterol measurements of Lab 1 and Lab 2 Subject Lab 1 Lab 2 1 296 318 2 268 287 3 244 260 4 272 279 5 240 245 6 244 249 7 282 294 ...
*Monday, July 21, 2014 at 4:15pm*

**Statistics**

Hi, Could anyone help me please, because I'm not sure with my answer, Thank you so much for your help and value time. Blood samples from 10 persons were sent to each of two labs for cholesterol determination. The measurements are recorded below: Table 1. Serum Cholesterol ...
*Monday, July 21, 2014 at 1:53pm*

**statistics**

In a batch of 8,000 clock radios 5% are defective. A sample of 14 clock radios is randomly selected without replacement from the 8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch will...
*Monday, July 21, 2014 at 10:53am*

**statistics**

Hi, Could anyone help me please, because I'm not sure with my answer, Thank you so much for your help and value time. Blood samples from 10 persons were sent to each of two labs for cholesterol determination. The measurements are recorded below: Table 1. Serum Cholesterol ...
*Monday, July 21, 2014 at 4:35am*

**statistics**

Wages and salaries make up only part of a total compensation. Other parts include paid leave, health insurance, and many others. In 2007, wages and salaries among manufacturers in the United States made up an average of 65.8% of total compensation. To determine if this changed...
*Sunday, July 20, 2014 at 10:38pm*

**Statistics/Probability**

A component is rejected if its has a diameter less than 70mm, reworked if the diameter is between 70 and 73.5mm or more than 78.5mm. The diameter of a component is normally distributed with a mean 76mm and standard deviation 2.5mm. In a batch of 400 components, determine the ...
*Sunday, July 20, 2014 at 2:49pm*

**college statistics**

The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries. The study collected current and beginning salary data for each of the 474 employees and the researcher conducted a ...
*Sunday, July 20, 2014 at 12:47pm*

**statistics**

According to the MIT Airline Data Project, American Airlines controlled 15.5% of the domestic market in 2010. A random sample of 125 domestic passengers that year was selected. Using the normal approximation to the binomial distribution, what is the probability that more than ...
*Sunday, July 20, 2014 at 11:05am*

**statistics**

what sampling strategies can be used if the maximum number of students she can include for her survey of 400 and the maximum number of students she can include for her interviews is 20.”
*Sunday, July 20, 2014 at 1:03am*

**statistics**

Construct a 95% prediction interval for the number of hours of sleep for an adult who is 45 years old
*Saturday, July 19, 2014 at 8:09pm*

**statistics**

Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the 95% confidence ...
*Saturday, July 19, 2014 at 11:04am*

**Introduction to statistics**

A researcher would like to estimate the population proportion of adults living in a certain town who have at least a high school education. No information is available about its value. How large a sample size is needed to estimate it to within 0.19 with 99% confidence? n= (...
*Thursday, July 17, 2014 at 2:46pm*

**statistics**

the daily milk production for a certain type of dairy cow has a mean of 43 pounds per day with a standard diviation of 5 pounds per day. Suppose this daily mild production has a normal distribution. Calculate the probability that a randomly selected cow of this type has a ...
*Thursday, July 17, 2014 at 4:34am*

**Statistics/Probability**

5) The product is sold in packets whose masses are normally distributes with mean of 1.42 kg and a standard deviation of 0.025 kg. (1) Find the probability that the mass of a packet, selected at random, lies between 1.37 kg and 1.45 kg
*Thursday, July 17, 2014 at 12:48am*

**Statistics/Probability**

A factory produces a particular type of electronic component. The probability of a component being acceptable is 0.95. The components are packed in boxes of 24. (i) Calculate the probability that a box, chosen at random, contains exactly 22 acceptable components. All the boxes...
*Thursday, July 17, 2014 at 12:46am*

**Statistics/Probability**

In the production of a particular model of cell phones, it is found that 5% are defective. Cellular phones are selected at random and put into boxes of 10. If a box is selected at random, find the probability that it contains. (i) Exactly three defective phones (ii) Less than ...
*Thursday, July 17, 2014 at 12:43am*

**Statistics/Probability**

The standard deviation of the masses of articles in a large population is 4.55 kg. Random samples of size 100 are drawn from the population. Find the probability that a sample mean will differ from the population mean by less than 0.8 kg.
*Thursday, July 17, 2014 at 12:26am*

**Statistics/Probability**

Each day a bakery delivers the same number of loaves of bread to local shop on the corner. On average the shop sells 75% of loaves. Assuming that the number of loaves sold per day has binomial distribution with a standard deviation of 9. Find the number of loaves the shop ...
*Thursday, July 17, 2014 at 12:19am*

**statistics**

A committee of three people is to be formed. The three people will be selected from a list of five possible committee members. A simple random sample of three people is taken, without replacement, from the group of five people. Using the letters A, B, C, D, E to represent the ...
*Wednesday, July 16, 2014 at 7:34pm*

**statistics**

assuming that you wished to have the highest possible score on an exam relative to ht e other scores, would you rather have a score of 70 on a test with a mean of 60 and a standard deviations of 5.2 or a score of 81 on a test with a mean of 79 and a standard deviation of 7.1?
*Monday, July 14, 2014 at 10:09pm*

**Measurements & statistics in Kinesiology**

In a class of 34 students, how many of them will have a z-score above 1.0?
*Monday, July 14, 2014 at 9:20pm*

**statistics**

M&M’s The candy company claims that 10% of the M&M’s it produces are green. Suppose the candies are packed at random into small bags containing about 25 M&M’s per bag. A class of elementary students learning about percentages opens several bags, counts the ...
*Monday, July 14, 2014 at 3:27pm*

**statistics**

M&M’s The candy company claims that 10% of the M&M’s it produces are green. Suppose the candies are packed at random into small bags containing about 25 M&M’s per bag. A class of elementary students learning about percentages opens several bags, counts the ...
*Sunday, July 13, 2014 at 10:36pm*

**statistics**

a brand name has a 50% recognition rate assume the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers the probability that exactly 4 of the 5 consumers recognize the brand name
*Sunday, July 13, 2014 at 10:08pm*

**statistics**

A doctor wants to know if her patients are happy with her. She decides to survey a sample of her clients. What method would be best for choosing a random sample that is a fair representation of her patients? A. Assign numbers to each patient and then use a random number ...
*Sunday, July 13, 2014 at 7:16pm*

**statistics**

a rocket club makes its own rockets. The rockets go to a mean height of 1100 feet with a standard deviation of 60 feet. if the club fires 36 rockets, what is probability that the mean heights of the rockets will be greater than 1080p feet
*Sunday, July 13, 2014 at 4:15pm*

**statistics**

the heights of the "basketball fans" at a highly anticipated basketball game.
*Saturday, July 12, 2014 at 6:27pm*

**psy 315**

using the 5 steps of hypothesis testing begining salary mean =17,016,09,sd7.870 and current salary mean= 34,419.5,7 sd=17,075 with n=474 of employees test statistics = 33.036,p<.05
*Friday, July 11, 2014 at 11:37pm*

**math 200 statistics**

ADHD a researcher studying ADHD among teenagers obtains a simple random sample of 100 teenagers aged 13 to 17 and asks them whether or not they have ever been prescribed medication for ADHD. To say that the distribution of sample proportion (P cap), the sample proportion of ...
*Friday, July 11, 2014 at 10:44pm*

**Statistics**

A COMMITTEE OF 5 PEOPLE IS TO BE FORMED FROM 15 PARENTS AND 10 teachers. Find the probability that the committee will consist of at least one parent.
*Friday, July 11, 2014 at 12:07am*

**Statistics/probability**

The random variable X has a binomial distribution with the probability of a success being 0.2 and the number of independent trials is 15. The random variable xbar is the mean of a random sample of 100 values of X. Find P(xbar<3.15).
*Thursday, July 10, 2014 at 3:00pm*

**Statistics/Probability**

The life span of a calculator has a normal distribution with a mean of 60 months and a standard deviation of 5 months. If a calculator is randomly selected, find the probability that the calculator has a life span of. (1) more than 50 months (2) between 4 years and 6 years.
*Thursday, July 10, 2014 at 1:56pm*

**statistics**

In the old days, we could buy 8 inch floppies for our computers on which to store our favorite programs and data. But, the manufacturing ability was not that good back then and 1% of these 8 inch floppies sold had a bad sector or two on them which made them have less memory ...
*Thursday, July 10, 2014 at 12:14am*

**statistics**

30 new babies were born yesterday in the hospital. If the average weight of a new born is 7.5 pounds with a standard deviation of 2.1 pounds, what is the probability of the average weight for these 30 newborns is between 7.2 and 7.6 pounds. Remember, all probabilities are ...
*Thursday, July 10, 2014 at 12:14am*

**statistics**

When using the normal approximation to the binomial, what is the standard deviation used in the standardization formula when approximating a binomial distribution with 226 trials and p=0.25? Please submit your answer with 4 decimal places
*Thursday, July 10, 2014 at 12:14am*

**statistics**

You have a box of 15 widgets whose average weight for each individual widget is 10 pounds with a standard deviation of 4.0 pounds. Based on this information, what is the standard deviation, taken to 4 decimal places, for the sample average of the weight of the widgets in the box?
*Thursday, July 10, 2014 at 12:12am*

**statistics**

When using the normal approximation to the binomial, what is the mean used in the standardization formula when approximating a binomial distribution with 123 trials and p=0.35? Please submit your answer with 2 decimal places
*Thursday, July 10, 2014 at 12:12am*

**statistics**

you have a box of 12 widgets whose average weight for each individual widget is 2.6 pounds with a standard deviation of 3.3 pounds. Based on this information, what is the mean, taken to 1 decimal place, for the sample average of the weight of the widgets in the box
*Thursday, July 10, 2014 at 12:11am*

**statistics**

Suppose that the ages of students at a particular university average 26 years with a standard deviation of 2.8 years. Consider the sampling distribution of the sample mean age of students in a sample of n = 49. The mean of the sampling distribution is __________
*Wednesday, July 9, 2014 at 11:14pm*

**Statistics/Probability**

The probability the New Year's day is on Saturday is a randomly chosen year is 1/7. 15 years was chosen randomly. Find the probability that, (1) Exactly four of these years have a New Year's day on a Saturday. (2) At least two of these years have New Year's day on ...
*Wednesday, July 9, 2014 at 4:32pm*

**statistics, probability**

It has been found out that the probability that a child is a male in family is 0.4. In a family of 6 children, what is the probability that; i. exactly 5 are boys ? ii. at least 4 are boys ? iii. all boys
*Wednesday, July 9, 2014 at 6:06am*

**Statistics**

The life of an electric light bulb is known to be normally distributed with a mean of 2000 hours and a std. of 120 hours. Find the probability that the life of such a bulb would be. (a) greater than 2150 hours (b) within the range of 1850 hours to 2090 hours
*Tuesday, July 8, 2014 at 2:55pm*

**Math (statistics)**

In an examination a candidate is given the four answers to four questions but is not told which answer applies to which question. He is asked to write down each of the four answers next to its appropriate question. b). show that there are 6 ways of getting just two answers in ...
*Tuesday, July 8, 2014 at 11:21am*

**statistics**

What formula do I use to solve: A sample with a mean of M = 40 and a variance of s2 = 20 has an estimated standard error of 2 points. How many scores are in the sample?
*Tuesday, July 8, 2014 at 8:06am*

**statistics**

A teacher wants to compare the mean geology scores of two different classes. She is testing the null hypothesis that there is no difference in the population mean scores of the two classes. The difference of the sample means is 51.4. If the standard deviation of the ...
*Monday, July 7, 2014 at 11:01pm*

**Math/Statistics**

A group of 10 students have average of GPA of 2.8 with SD of 0.3. Does this group present enough evidence to indicate that the average GPA is less than 3.0? Make your decision at a 5% level of significance.
*Monday, July 7, 2014 at 6:29pm*

**Statistics**

A group of 10 students have average of GPA of 2.8 with SD of 0.3. Does this group present enough evidence to indicate that the average GPA is less than 3.0? Make your decision at a 5% level of significance
*Monday, July 7, 2014 at 5:27pm*

**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 sample data to construct and ...
*Monday, July 7, 2014 at 3:59pm*

**statistics**

Could someone let me know if I did this correctly? Source Sum of Squares (degrees of freedom [df]) Mean Square Fobt. Fcrit. Gender 68.15 1.07 68.15/63.685 0.59 1.07,1,2 Marital Status 127.37 3.04 63.685/20.95 0.75 3.04,2,2 Gender * Marital Status (A x B) 41.90 2.28 20.95/9.2 0...
*Monday, July 7, 2014 at 3:04pm*

**statistics**

As a marketing promotion a company is going to give the first 200 customers a coupon for a discount when they enter the store. The customer cannot scratch off the coupon until they check out. the company orders 200 coupons and 150 are for 5% off, 30 are for 10% off, 15 are for...
*Monday, July 7, 2014 at 1:27am*

**statistics**

Describe one of the following experiments, which study human subjects, in 450 to 750 words: A pharmaceutical company wants to test a new sleep aid. An educational company is interested in determining whether their new math curriculum will raise standardized test scores. ...
*Sunday, July 6, 2014 at 4:50pm*

**statistics**

If you are told the mean grade in ECON 2023 is 80 with a standard deviation of 5, what is the probability that if you randomly selected 36 students you would find an average grade of 82 or more? I found the Z-score: 82-80/5 Which gave me .6554 then 1-.6554=.3446 So 34% would ...
*Sunday, July 6, 2014 at 1:32pm*

**statistics**

Blood type AB is found in only 3% of the population†. If 240 people are chosen at random, find the probability of the following. (Round your answers to four decimal places.) (a) 5 or more will have this blood type (b)between 5 an 10 will have this blood type
*Saturday, July 5, 2014 at 9:10pm*

**Math**

Statistics show that the sales force of a certain company successfully closed 296 sales out of 800 sales calls. What was their percent success rate?
*Friday, July 4, 2014 at 5:55pm*

**Statistics**

If a couple has 4 children and none are from multiple births or twins. With the probability of sons being 50% how many sons would they expect to have?
*Friday, July 4, 2014 at 5:45pm*

**Statistics**

The mean score on the first calculus exam was 55%. The standard deviation was 7%. Find the smallest interval about the mean that must contain at least 83% of the scores. heeellllppppp
*Friday, July 4, 2014 at 3:50pm*

**statistics**

At the start of December 2001, the retail price of a 25kg bag of cornmeal was $10 in Zambia, while by the end of the month, the price had fallen to $6. The result was that one retailer reported an increase in sales from 3 bags/day to 5 bags/day. Assume that the retailer is ...
*Thursday, July 3, 2014 at 12:57am*

**statistics**

in november 2008, apple stock dropped from $105 to $95 per share, and Microsoft dropped from $21 to $20 per share. If you invested a total of $3,570 in these stocks at the end of October and sold them for $3,250 at the end of November, how many shares of each stock did you buy?
*Thursday, July 3, 2014 at 12:54am*

**statistics**

help! where do i begin with this problem...in one area, monthly incomes of technology related workers have a standard deviation of $650. It is believed that the standard deviation of monthly incomes of non-technology workers is higher. A sample of 71 non technology workers are...
*Tuesday, July 1, 2014 at 6:49pm*

**statistics**

how much sale tax in due for a payment of 993.91
*Tuesday, July 1, 2014 at 2:00pm*

**statistics**

One of the ways most people relieve stress is to reward themselves with sweets. According to one study in Food Technology, 46 percent admit to overeating sweet foods when stressed. Suppose that the 46 percent figure is correct and that a random sample of 100 people is selected...
*Tuesday, July 1, 2014 at 9:23am*

**Statistics **

Compute the critical value za/2 that corresponds to a 85% level of confidence.
*Monday, June 30, 2014 at 10:53pm*

**Statistics **

An investor has $1400 to invest, and his financial analyst recommends two types of junk bonds. The A bonds have a 6% annual yield with a default rate of 3%. The B bonds have a 9% annual yield with a default rate of 7%. (If the bond defaults, the $1400 is lost.) Which of the ...
*Monday, June 30, 2014 at 10:39pm*

**Statistics**

A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given class period runs between 50.25 and 50.5 minutes.
*Monday, June 30, 2014 at 10:34pm*

**Statistics**

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the Internet? Assume that we want to be...
*Monday, June 30, 2014 at 10:31pm*

**statistics**

A Gallup poll of 1236 adults showed that 12% of the respondents believe that it is bad luck to walk under a ladder. Consider the probability that among 30 randomly selected people from 1236 who were polled, there are at least 2 who have that belief. Given that the subjects ...
*Monday, June 30, 2014 at 10:21pm*

**Statistics**

Find the critical value za/2 that corresponds to the given confidence level. 96%
*Monday, June 30, 2014 at 10:17pm*

**Statistics**

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial. n=21, x=18, p=0.75
*Monday, June 30, 2014 at 9:59pm*

**Statistics**

The distribution of IQ scores is a nonstandard normal distribution with a mean of 100 and a standard deviation of 15. What are the value of the mean and standard deviation after all IQ score have been standardized by converting them to z scores?
*Monday, June 30, 2014 at 9:57pm*

**Statistics**

Find the critical values x2L and x2R that correspond to the given confidence level and sample size. 99%: n=23
*Monday, June 30, 2014 at 9:54pm*

**statistics**

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use a binomial probabilities table to find the probability of x successes given the probability p of success on a given trial. n=8, x=2, p=0.30
*Monday, June 30, 2014 at 9:50pm*

**Statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 320 babies were born, and 256 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the results, ...
*Monday, June 30, 2014 at 9:47pm*

**statistics**

simple randon sampling uses a sample size n
*Monday, June 30, 2014 at 4:19pm*

**Statistics**

An unbiased die is thrown seven times. Find the probability of throwing it at least five six's.
*Monday, June 30, 2014 at 3:52pm*

**statistics**

Select which of the following are examples of parameters from these examples. Question options: The probability that a ticket with be a winner is .2 (or a 20% chance) The proportion of winning tickets in the sample of 100 99% of samples will have between 37% and 43% of voters ...
*Sunday, June 29, 2014 at 3:41pm*

**statistics**

use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight. Interpret the three confidence intervals in terms of whether there is a significant difference between the mean of the sample and a hypothesized mean of 150.
*Sunday, June 29, 2014 at 9:59am*

**statistics**

The inside diameter of metal washers produced by a company are normally distributed with a mean of .5 inches and a standdrd deviation of .01 inches. Of all washers produced .8% of the washers are rejected because they are too small for a bolt used to test them. What is the ...
*Saturday, June 28, 2014 at 1:31am*

**statistics**

To find out what people think, the Gallup Poll selected a random sample of 520 women and 506 men. The pollsters showed them a list of personal attributes and asked them to indicate whether each attribute was “generally more true of men or of women”. When asked about ...
*Friday, June 27, 2014 at 11:38pm*

**statistics**

2. A researcher measures the heart rate in a population of runners and finds they have an average heart rate of µ = 50, σ = 5. You do not need to show a graph, only computation work. 2A. Based on the average heart rate cited above, what proportion would we expect to...
*Friday, June 27, 2014 at 8:19pm*

**statistics**

construct a 95% confidence interval estimate for the population mean MPG of 2010 family sedans, assuming a normal distribution.
*Friday, June 27, 2014 at 5:57am*

**Statistics (Check Work)**

Can Someone help me with these 2 problems? I am certain I am solving them correctly, but for some reason the computer keeps marking my answers as incorrect. Question 1: Minnesota had the highest turnout rate of any state for the 2012 Presidential election. Political analysts ...
*Thursday, June 26, 2014 at 6:09pm*

**Statistics**

1. In a study of heart disease in male federal employees, researchers classified 170 volunteer subjects according to their socioeconomic status (SES) and their smoking habits. SES categorized as high and low. Individuals were asked whether they were smokers or non-smoker. Here...
*Thursday, June 26, 2014 at 2:34pm*

**statistics**

A sample of 40 CDs from a student's collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95% confidence interval for the population standard deviation. (Round your answers to 4 decimal places.)
*Thursday, June 26, 2014 at 12:09am*

**statistics**

Facebook reports that the average number of Facebook friends worldwide is 150 with a standard deviation of 90. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 165 friends or more?
*Tuesday, June 24, 2014 at 2:35pm*

**statistics**

according to statistics, the maximum heart rate should be 220 minus a person's age. how would you interpret your highest rate in relation to that given?
*Tuesday, June 24, 2014 at 8:09am*

**Statistics**

No idea where to begin... Do men or women watch more T.V. per day? To answer the question two samples were select with the help of SPSS and the following results were produced. Is there a significant difference between men and women in watching T.V.? Perform five-step model to...
*Sunday, June 22, 2014 at 12:55pm*

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