Friday

November 28, 2014

November 28, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics**

How do the 3rd grade boys’ weight in Principal Ben’s school compare to the national average (mean weight = 90, sd =15)? Provide the IV, DV, and best method of analysis.
*Thursday, November 14, 2013 at 11:20pm*

**statistics**

Find the mean, the median, and the mode for the following data. 21 21 22 22 22 26 34 Mean 335.1 rounded to 335, median 22, mode is 22
*Thursday, November 14, 2013 at 11:00pm*

**statistics**

I have to find mean, median and mode did I do this right? 21,21,22,22,22,26,34
*Thursday, November 14, 2013 at 10:57pm*

**statistics**

A teacher finds that the test scores of a group of 40 students have a mean of 75 and a standard deviation of 10. If Anne has a test score of 88, what is Anne’s z-score?
*Thursday, November 14, 2013 at 10:32pm*

**statistics**

Calculate and interpret a 95% confidence interval for the mean bp in the pop of ALL anabolic-steroid using athletes: random sample of 9 athletes resulting in a sd of 207.8, and 109 respectively. When random sample is less than 30, don't I find a t score?
*Thursday, November 14, 2013 at 8:43pm*

**statistics**

David wants to rent an unfurnished apartment for next semester. He took a random sample of 9 apartments adversised in the local Halifax paper, and recorded the rental rates. The rents (in $ per month) were: 500 650 600 505 450 550 515 495 640 a) Find a 90% confidence interval ...
*Thursday, November 14, 2013 at 5:59pm*

**Statistics**

Which of the following graphs would be best to use to display the number of discharges by medical service for the past year? Line or bar graph?
*Thursday, November 14, 2013 at 12:28pm*

**Statistics**

In the following two questions, identify which choices would be considered inferential statistics and which would be considered inferential statistics. 1. of 500 randomly selected people in new york city, 210 people had O+ blood. a) "42 percent of the people in NYC have O...
*Thursday, November 14, 2013 at 12:12pm*

**Statistics**

In the following two questions, identify which choices would be considered inferential statistics. 1. of 500 randomly selected people in new york city, 210 people had O+ blood. a) "42 percent of the people in NYC have O+ blood" Is the statement descriptive statistics...
*Thursday, November 14, 2013 at 12:11pm*

**statistics**

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 89% of children at risk. A concerted ...
*Thursday, November 14, 2013 at 12:45am*

**Math Statistics**

A company sells cans of chicken soup that that are advertised to contain 20 oz. However due to variations in the manufacturing process, the volume of soup in the cans is, in fact, Normally distributed with a mean of 20.1 oz and a standard deviation of 0.4 oz. • What is ...
*Thursday, November 14, 2013 at 12:13am*

**Statistics Question 3**

A company sells cans of chicken soup that that are advertised to contain 20 oz. However due to variations in the manufacturing process, the volume of soup in the cans is, in fact, Normally distributed with a mean of 20.1 oz and a standard deviation of 0.4 oz. • What is ...
*Wednesday, November 13, 2013 at 7:16pm*

**statistics Question 2**

Suppose a person buys 100 shares of stock at in a company at the cost price of $10 per share. He plans to sell at the end of the next month at whatever is the price at that time. The projected price of the stock at the end of next month and the corresponding probability of ...
*Wednesday, November 13, 2013 at 7:15pm*

**Statistics Question 1**

According to the American Heart Association, one in every four deaths in the U.S. is due to heart disease. Suppose 25 people will die in the U.S. in the next 5 minutes. • What is the chance that exactly 5 of the deaths will be due to heart disease? • What is the ...
*Wednesday, November 13, 2013 at 7:13pm*

**Statistics**

Suppose a person buys 100 shares of stock at in a company at the cost price of $10 per share. He plans to sell at the end of the next month at whatever is the price at that time. The projected price of the stock at the end of next month and the corresponding probability of ...
*Wednesday, November 13, 2013 at 7:09pm*

**statistics**

According to the American Heart Association, one in every four deaths in the U.S. is due to heart disease. Suppose 25 people will die in the U.S. in the next 5 minutes. • What is the chance that exactly 5 of the deaths will be due to heart disease? • What is the ...
*Wednesday, November 13, 2013 at 7:07pm*

**Statistics**

Suppose a random variable X has a uniform distribution over the interval [-10,10]. • Find the probability that X lies between -2 and 6? • Find the probability that X2 lies between 9 and 64? (Note X2 is the square of X.)
*Wednesday, November 13, 2013 at 7:05pm*

**statistics**

Please help- A random sample of n=500 households where 150 have combined cable,phone, and internet service. Firrst, calculate p-hat, the sample proportion of households having such service. Then use a confidence level for pi, the proportion of all households in this area that ...
*Wednesday, November 13, 2013 at 6:51pm*

**Statistics**

A random sample of 50 students chosen from an elementary school with 400 students was found to have a mean allowance of $26 per week with a standard deviation of $8. Obtain a 98% confidence interval for the total amount of allowance money given to students in this school per ...
*Wednesday, November 13, 2013 at 4:32pm*

**Stats**

A company with two plants producing the same product, but with two slightly different manufacturing processes, conducted a sample study at each of the two plants with the following results: The sample statistics from the first group are: n = 40, x-bar = 18, s = 4.2. The sample...
*Wednesday, November 13, 2013 at 3:32pm*

**statistics**

standard deviation 1.2. Random selection of 70 found a mean of 5.2. I have to find a 87% confidence level given this info?
*Wednesday, November 13, 2013 at 10:19am*

**statistics**

skating speeds are normally distributed with a mean of 60 and a standard deviation of 10. Determine the speed that separates the top 6% from the rest.
*Wednesday, November 13, 2013 at 10:08am*

**statistics**

average commuting distance 10.9 miles which is also the mean of a sample of 300 commuters. Sample sd is 6.2 miles . Estimate the true mean using 99% confidence please.
*Wednesday, November 13, 2013 at 10:05am*

**Math Statistics**

An amusement park, Dino World, considering adding some new attractions, conducted a study over several typical days and found that, of 10,000 families entering the park, 1020 brought just one child (defined as younger than age 12), 3370 brought two children, 3510 brought three...
*Wednesday, November 13, 2013 at 9:07am*

**statistic**

3 statistics professors and 7 chemistry professors are available to be advisors.If each professor has an equal chance of being selected, what is the probability that both professors are cgemistry professors?
*Wednesday, November 13, 2013 at 8:52am*

**statistics**

The average gasoline price of one of the major oil companies has been $3.20 per gallon. Because of cost reduction measures, it is believed that there has been a significant reduction in the average price. In order to test this belief, we randomly selected a sample of 36 of the...
*Tuesday, November 12, 2013 at 8:44pm*

**Statistics**

You are given the following information obtained from a random sample of 6 observations. Assume the population has a normal distribution. 13 14 17 14 17 15 a. What is the point estimate of µ? b. Construct an 80% confidence interval for µ. c. Construct a 98% ...
*Tuesday, November 12, 2013 at 2:44pm*

**Statistics**

The monthly incomes from a random sample of workers in a factory are shown below. Monthly Income (In $1,000) 4.0 5.0 7.0 4.0 6.0 6.0 7.0 9.0 a. Compute the standard error of the mean (in dollars). b. Compute the margin of error (in dollars) at 95% confidence. c. Compute a 95% ...
*Tuesday, November 12, 2013 at 2:33pm*

**Statistics**

The table below shows the LOS for a sample of 11 discharged patients. Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal place. a. Mean b. Range ...
*Monday, November 11, 2013 at 7:37pm*

**Statistics**

A state survey investigates whether the proportion of 8% for employees who commute by car to work is higher than it was five years ago. A test on employee commuting by car was done on a random sample size of 1000 and found 100 commuters by car. Test an appropriate hypothesis ...
*Monday, November 11, 2013 at 6:12pm*

**Statistics**

An opinion poll asks a random sample of 100 college seniors how they view their job prospects. In all, 53 say "Good." The 95% confidence interval has a margin of error of 9.9%. The sample used actually included 130 college seniors but 30 of the seniors refused to ...
*Monday, November 11, 2013 at 3:51pm*

**Statistics**

The U.S. Department of Labor and Statistics released the current unemployment rate of 5.3% for the month in the U.S. and claims the unemployment has not changed in the last two months. However, the states statistics reveal that there is a decrease in the U.S. unemployment rate...
*Monday, November 11, 2013 at 2:52pm*

**Statistics**

To plan the budget for next year a college needs to estimate what impact current economic downturn might have on student requests for financial aid. Historically, this college has provided aid to 35% of its students. Officials look at a random sample of this year’s ...
*Monday, November 11, 2013 at 2:50pm*

**Statistics**

1. A Type II error occurs when you reject the null hypothesis when the null hypothesis is true. A) True (this one?) B) False 2. A Type II error occurs when you fail to reject the null when the null hypothesis is false. A) True (this one?) B) False
*Monday, November 11, 2013 at 12:09pm*

**Statistics**

We conducted a hypothesis test for a population parameter at alpha = 0.05 and we failed to rejected Ho. If we decided to use alpha = 0.10, how would our conclusion change? A) At alpha = 0.10, we would still fail to reject HO. B) At alpha = 0.10, we would reject HO. C) It is ...
*Monday, November 11, 2013 at 9:51am*

**Statistics**

We conducted a hypothesis test for a population parameter at alpha = 0.01 and we failed to rejected Ho. If we decided to use alpha = 0.05, how would our conclusion change? A) At alpha = 0.05, we would still fail to reject HO. B) At alpha = 0.05, we would reject HO. C) It is ...
*Monday, November 11, 2013 at 9:50am*

**Statistics**

Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
*Sunday, November 10, 2013 at 6:32pm*

**Statistics**

Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
*Sunday, November 10, 2013 at 6:31pm*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*Sunday, November 10, 2013 at 3:07pm*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*Sunday, November 10, 2013 at 3:06pm*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*Sunday, November 10, 2013 at 3:05pm*

**statistics**

using the following information, determine if the differences between the means are significant medical terminolgy class. Group A = number of word elements remembered by students using flash cards, group B= number of word elements remembered by students not using flash cards. ...
*Saturday, November 9, 2013 at 11:08pm*

**statistics**

based on the results below, how would you decribe the relationship between heart attack patients being treated with aspirin and whether or not they live? males who lived and treated with aspirin = 15, males who did not live, and treated with aspirin = 2, and males who lived ...
*Saturday, November 9, 2013 at 10:57pm*

**statistics**

Assume that human body temperature are normally distributed with a mean 98.21 F and a standard deviation of 0.61F a)A hospital uses 100.6 as the lowest temperature considered to be a fever. What percentage of normal and healthy persons would be considered to have a fever. Does...
*Saturday, November 9, 2013 at 9:57pm*

**statistics**

given the following information, determine the 68.3 percent, 95.5 percent, and 99.7 percent confidence intervals. Mean = 4.33, standard error of the mean =3
*Saturday, November 9, 2013 at 9:48pm*

**Statistics **

Use the following dates to compute the ALOS and median LOS and range. The discharge date is July 2nd (non-leap year). Round the ALOS to one decimal place. Admission Date LOS 1-2 January = 29; February = 28; March = 31; April = 30; May = 31; June = 30; July = 2; Total = 181 1-...
*Saturday, November 9, 2013 at 5:40pm*

**Statistics **

The table below shows the LOS for a sample of 11 discharged patients. Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal place. a. Mean b. Range c...
*Saturday, November 9, 2013 at 2:14pm*

**Statistics**

30 randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. The 99% confidence interval is ( ounces, ounces). Round each result to two decimal places.
*Saturday, November 9, 2013 at 9:56am*

**Statistics**

30 randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. Test the claim that cans of coke have a mean amount of cola greater than 12 ounces. What is the p-value? A) ...
*Saturday, November 9, 2013 at 9:55am*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*Saturday, November 9, 2013 at 9:10am*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*Saturday, November 9, 2013 at 9:08am*

**statistics**

Find the indicated critical value. z 0.04 Round to two decimal places as needed. My answer is 1.75 what do guys think.
*Saturday, November 9, 2013 at 7:27am*

**statistics**

Find the indicated z score. The graph depicts the standard distribution with a mean 0 and standard deviation 1. 0.945 My answer is 1.6901 but I am not sure if it is correct.
*Friday, November 8, 2013 at 8:52pm*

**Statistics**

A researcher performs a hypothesis test to test the claim that among girls aged 9-10, the mean score on a particular aptitude test differs from 72, which is the mean score for boys of the same age. Data were collected from a random sample of 43 girls aged 9-10 years and the 95...
*Friday, November 8, 2013 at 7:21pm*

**Statistics**

A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful if the average time spent on the deliveries does not exceed 30 minutes. The owner has randomly ...
*Friday, November 8, 2013 at 7:19pm*

**Statistics**

In creating a frequency distribution table, which of the following statement is not a basic rule to follow? a) Choose classes that cover the smallest and largest values. b) Make certain that each item can go into only one class. c) As a general rule, use between 10 and 15 ...
*Friday, November 8, 2013 at 10:12am*

**Statistics**

When creating histograms, which is true statement? a) Form classes of equal width b) Alwyas form frequency groups that do not overlap c) Establish between five and 15 frequency groups d) All of the above.
*Friday, November 8, 2013 at 10:09am*

**Statistics**

I already found part A just need help with B! The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct...
*Thursday, November 7, 2013 at 11:06pm*

**statistics**

Assume that women's heights are normally distributed with a mean given by u=64.6 in and a standard deviation given by 0=2.8in. a) If 1 woman is randomly selected, find the probability that her height is less than 65in. b) If 49 women are randomly selected, find the ...
*Thursday, November 7, 2013 at 9:03pm*

**Statistics**

In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1 to 10. The date follow: Number of Cups of Coffee 3,2,4,6,5,1,7,3 Stress Level 5,3,3,9,4,2,10,5 Calculate a Pearsons r to determine the...
*Thursday, November 7, 2013 at 8:47pm*

**statistics**

Assume that adults have IQ score that are normally distributed with a mean of 105 and a standard deviation 20. Find P, which is the IQ score separating the bottom 10% from the top 90%. Round to the nearest hundredth as needed.
*Thursday, November 7, 2013 at 11:13am*

**Statistics**

You draw nine cards from a standard deck of cards. What is the probability that a. four or more will be red, b. exactly two or three will be red, c. two or fewer will be red, and d. exactly five will be red?.
*Thursday, November 7, 2013 at 8:30am*

**Statistics**

Using a 0.05 level of significance, test the hypothesis that the probability of the NCAA Division I basketball champion being from the Pac 10 is 20%. Repeat the test for the hypothesis that the probability the champion is UCLA is 20%. What do these results say about testing ...
*Thursday, November 7, 2013 at 2:49am*

**Statistics**

When consumers apply for credit, their credit is rated using the FICO score. A bank manager used a random sample of the credit scores of 18 customers and determined the following 95% confidence interval: (613.6, 708.0) If the sample used 45 customers rather than 18 customers, ...
*Wednesday, November 6, 2013 at 7:51pm*

**Statistics**

A scientist in Smallville tested the cholesterol of a random sample of 35 town residents. He constructed the following confidence interval: t-interval for μ: with 99.00% Confidence: 188 < μ(Cholesterol) < 206 What is the margin of error? A) 18 B) 9 C) 1.09 D) ...
*Wednesday, November 6, 2013 at 7:49pm*

**Statistics**

In a large collection of real SMS text messages from particular cellphone users, 13.40% of messages are identified as spam. Of all spam messages 17.0% contain both the word "free" and the word "text" ("txt") For example, "Congrats!! You have ...
*Tuesday, November 5, 2013 at 5:54pm*

**statistics**

The weight of a can made from a machine is normally distributed with a mean of 25 grams and a standard deviation of 0.4 grams. What percentage of the cans from this machine would not meet the minimum required weight of 24 grams? Round to the nearest hundredth of a percent
*Tuesday, November 5, 2013 at 4:49pm*

**Statistics**

1,3,5,3,2,29,3,4,2,1,2 Mean 5 Range 28 Variance 64.8 Standard Deviation 8.0 1.What value is affecting the mean and SD of this distribution? 2.Does the mean adequately represent this disribution? If bot, what would be a better measure of central tendency for this data set?
*Tuesday, November 5, 2013 at 11:13am*

**Statistics**

when two variables are correlated it means that one is the cause of the other. true or false?
*Tuesday, November 5, 2013 at 10:41am*

**statistics**

In a region, 90% of the population have brown eyes. If 15 people are randomly selected, find the probability that at least 13 of them have brown eyes. Is it unusual to randomly select 15 people and find that at least 13 of them have brown eyes? Why or why not?
*Monday, November 4, 2013 at 8:08pm*

**Statistics**

The p-value is the probability of the observed statistic given the null hypothesis is true. A) True B) False False?
*Monday, November 4, 2013 at 4:59pm*

**Statistics**

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey (randomly generated phone numbers were used) of ...
*Monday, November 4, 2013 at 4:57pm*

**statistics-PLEASE HELP quick**

I have less than 24 hours to find the binomial probability of P(20<x<23)= and P(x>23)= if n=30 p=.23 u=6.9 q=.77 and the standard deviation is 2.3 can someone please show me how to get the outcome they want?
*Monday, November 4, 2013 at 3:44pm*

**Statistics**

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*Monday, November 4, 2013 at 2:44pm*

**Statistics Help Please**

A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about $0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new method that involves ...
*Monday, November 4, 2013 at 2:42pm*

**Statistics**

The business college computing center wants to determine the proportion of business students who have laptop computers. If the proportion exceeds 35%, then the lab will scale back a proposed enlargement of its facilities. Suppose 200 business students were randomly sampled and...
*Monday, November 4, 2013 at 2:35pm*

**statistics**

Tall clubs international is a social organization for tall people. It has a height requirement that men must be at least 74 in. and women must be at least 70 in. tall. If men's heights have a normal mean of 69.0 in and a deviation of 2.8 and women's normal heights have...
*Monday, November 4, 2013 at 1:55pm*

**statistics**

If P=.23 and n=30 what is the outcome of P(20<x<23)= P(x>23)= please show the whole solution so I can learn how and why the outcome was achieved. Thanks so much.
*Monday, November 4, 2013 at 1:42pm*

**Healthcare Statistics**

In deciding whether to purchase or lease a new dictation system, the HIM supervisor calculates the payback period. The hospital's required payback period is three years. If the equipment costs $ 28,000 and generates $3,500 per year in savings, what would be the payback ...
*Sunday, November 3, 2013 at 8:56pm*

**Healthcare Statistics**

the coding section in the HIM department shows its first-quarter budget analysis as having an expected cost of operation of $62,000. However, the actual cost of operation was $76,000. calculate the budget variance.
*Sunday, November 3, 2013 at 7:01pm*

**Statistics**

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*Sunday, November 3, 2013 at 6:37pm*

**Statistics Problems**

The bank sets up an experiment to test the effectiveness of the DVD. The mail it out to a random sample of delinquent customers and keep track of how many actually do contact the bank to arrange payments. The bank's statistician calculates a p-value (probability-value) of ...
*Sunday, November 3, 2013 at 6:35pm*

**Statistics**

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 5%. the type of alternative hypothesis is: left-tailed right-tailed or two-tailed Is this right-tailed?
*Sunday, November 3, 2013 at 6:33pm*

**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 in a given trial. n= 3 , x=1, p= 0.60
*Sunday, November 3, 2013 at 5:56pm*

**Statistics**

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
*Sunday, November 3, 2013 at 4:16pm*

**Statistics**

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*Sunday, November 3, 2013 at 4:13pm*

**Statistics**

your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is your percentile?
*Sunday, November 3, 2013 at 11:46am*

**Statistics**

Dear Lee, Please confirm these answers to this question. your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, ...
*Sunday, November 3, 2013 at 11:25am*

**Statistics**

your medical terminology instructor listed the following grades for the class out of a 75 point test:<br /> 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70<br /> a.find the 90th percentile<br /> b. your score was 59, what is your ...
*Sunday, November 3, 2013 at 11:17am*

**Probability and Statistics**

Random Variables X and Y follow a joint distribution: f(x,y)=(6-x-y)/8 if 0<x<2, 2<y<4 and 0, else Find P(1<Y<3|X=1) I first got the marginal distribution for x and got (3-x)/4 (Integrated from 2 to 4)and then got the conditional dist and got (5-y)/4 and then...
*Saturday, November 2, 2013 at 12:40pm*

**Statistics **

The bank sets up an experiment to test the effectiveness of the DVD. The mail it out to a random sample of delinquent customers and keep track of how many actually do contact the bank to arrange payments. The bank's statistician calculates a p-value (probability-value) of ...
*Saturday, November 2, 2013 at 10:37am*

**Statistics**

A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about $0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new method that involves ...
*Saturday, November 2, 2013 at 10:36am*

**Statistics**

Is the p-value to the below question 0.4995? Do you reject or fail to reject the null hypothesis? Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women ...
*Saturday, November 2, 2013 at 9:10am*

**Statistics**

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
*Saturday, November 2, 2013 at 8:59am*

**statistics**

Assure that a procedure yields abinomial distribution with a trial repeated n times. Use abinomial probabilities table to find the probability if x sucesses given the probability of sucess of a given trial. n=6 x=0 p= 0.70
*Friday, November 1, 2013 at 10:30pm*

**Probability and Statistics**

Random Variables X and Y follow a joint distribution: f(x,y)=(6-x-y)/8 if 0<x<2, 2<y<4 and 0, else Find P(1<Y<3|X=1) I first got the marginal distribution for x and got (3-x)/4 (Integrated from 2 to 4)and then got the conditional dist and got (5-y)/4 and then...
*Friday, November 1, 2013 at 6:53pm*

**statistics**

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 1 3 1 6 3 6 1 4 4 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
*Friday, November 1, 2013 at 3:46am*

**statistics**

The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.) x 7 6 9 11 11 5 14 8 ...
*Friday, November 1, 2013 at 3:41am*

**Statistics**

The coding department of a large physician clinic is interested in purchasing a software program that will edit claims before they are sent out to billing. The license fee for the software costs $34,000 per year. The software is expected to reduce the number of errors on ...
*Thursday, October 31, 2013 at 2:12pm*

**statistics**

if n=30 and p=.23 what is P(20,x,23)= and P(x.23)= I think I need to find the z scores in order to solve but how do I read the table or do I even need it. UGH! so confusing especially 20 years later.
*Thursday, October 31, 2013 at 12:32pm*

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