Saturday

October 25, 2014

October 25, 2014

**Recent Homework Questions About Statistics**

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**statistics**

A bottling commpany produces bottles that hold 10 ounces of liquid . Periodically, the company gets complaints that their bottles are not holding enough liquid. To test this claim, the bottling company randomly samples 25 bottles and finds the average amount of liquid held by ...
*Thursday, May 22, 2014 at 4:46pm*

**Statistics**

Determine whether the following statements are true or false: 1. P(A and B)=P(B|A)P(B). 2. When A and B are independent, P(A)=P(B). 3. When A and B are independent, P(A|B)=P(A). 4. When A includes B, P(A|B)=1. 5. When B is the complement of A, P(A or B)=1. 6. When B is the ...
*Thursday, May 22, 2014 at 2:51pm*

**Statistics**

Coaching companies claim that their courses can raise the SAT scores of high school students. But students who retake the SAT without paying for coaching also usually raise their scores. A random sample of students who took the SAT twice found 427 who were coached and 2733 who...
*Thursday, May 22, 2014 at 1:03pm*

**Statistics**

Who is the king of late night TV? An Internet survey estimates that, when given a choice between David Letterman and Jay Leno, 52% of the population prefers to watch Jay Leno. Suppose that you randomly select three late night TV watchers and ask them which of the two talk show...
*Thursday, May 22, 2014 at 11:26am*

**Statistics/Probability**

So I tried solving the first one and apparently failed miserably, attempted both twice and got it wrong each time and I have one submission attempt left, so any help is definitely appreciated! 1. Hotels R Us has kept the following recordes concerning the number of guests in a ...
*Wednesday, May 21, 2014 at 2:01pm*

**statistics**

predict the score in statistics for a student whose score in mathematics is 30
*Wednesday, May 21, 2014 at 10:33am*

**Statistics**

A confidence interval for a population mean has a margin of error of 3.1. a)Determine the length of the confidence interval. b)If the sample mean is 56.7, obtain the confidence interval.
*Wednesday, May 21, 2014 at 5:01am*

**Statistics/Probability**

So I tried solving the first one and apparently failed miserably, attempted both twice and got it wrong each time and I have one submission attempt left, so any help is definitely appreciated! 1. Hotels R Us has kept the following recordes concerning the number of guests in a ...
*Tuesday, May 20, 2014 at 9:35pm*

**statistics**

A company has 140 employees, of which 30 are supervisors. Eighty of the employees are married, and 20% of the married employees are supervisors. If a company employee is randomly selected, what is the probability that the employee is married and is a supervisor?
*Tuesday, May 20, 2014 at 10:45am*

**statistics **

A test consists of 12 multiple choice questions with 5 choices for each question. As an experiment, you GUESS on each and every answer without even reading the questions. Probability of getting less than 4 questions correct on this test is:
*Tuesday, May 20, 2014 at 1:36am*

**Statistics**

In a random sample of 50 undergraduate students at a college, it was found that 44 students regularly access social networking websites from their college library. What is the margin of error for the true proportion of all undergraduates who access social networking sites from...
*Monday, May 19, 2014 at 3:20pm*

**statistics**

An IQ is designed so that the mean is 100 and the standard deviation is 23 for the population of Normal adults, find the sample size necessary to estimate the mean IQ score of statistics students Such that it can be said with 90% confidence that the sample mean is within 5 IQ ...
*Monday, May 19, 2014 at 1:40pm*

**statitics**

Certain data includes 36 body temperatures for which the sample mean is equal to 98.20 °F and standard deviation of 0.62 °F. Using this sample statistics, construct a 95% confidence interval of the mean body temperature. What does the sample suggest about the use of 98...
*Monday, May 19, 2014 at 6:18am*

**statistics**

36 people surveyed at random and learned that 20 people are in favor of a new shopping mall. What is a good estimate that person chosen at random in her town would favor a new shopping mall.
*Sunday, May 18, 2014 at 2:44pm*

**statistics**

A survey of 100 commuters finds the average commuting to work is 25.5 minutes with the standard deviation of 11.5 minutes. construct a 98% confidence interval for the mean commuting time of commuters answer: 100%-98%=2%=0.02=0.01=1.28 E=1.28.11.5 divide by 10= 1.47 (25.5-1.47...
*Sunday, May 18, 2014 at 8:19am*

**statistics**

A pop-music record firm wants the distribution of lengths of cuts on its record to have an average of 129 seconds and a standard deviation of 10 seconds so that disc jockeys will have plenty of time for commercials within each 5-minute period. The population times for cuts is ...
*Saturday, May 17, 2014 at 7:08pm*

**Statistics**

You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic "average number of vehicles per household is 1.9." Which average (mean, median, mode) would be best if: You wanted to be ...
*Saturday, May 17, 2014 at 12:41am*

**Statistics**

Describe whether the following study would most likely be "observational" or experimental", and why it would be so. The nurses on the 5th floor record the medicines administered everyday and report results to the doctors.
*Saturday, May 17, 2014 at 12:39am*

**Statistics**

Find the range and the standard deviation (correct to two decimal places). 77, 89, 96, 96, 102
*Friday, May 16, 2014 at 2:39pm*

**Statistics**

Please answer yes or no to the following question for my statistics project: Are you in favor of welfare for those in need?
*Friday, May 16, 2014 at 9:04am*

**statistics**

The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than 10 days? More than 21 days?
*Thursday, May 15, 2014 at 3:52am*

**Statistics**

Suppose you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information you have. Your boss has asked you to put together a report
*Wednesday, May 14, 2014 at 10:48pm*

**Statistics**

A study found that 82% of elementary students buy lunch at school at least once a month. How large a sample would be necessary to estimate the true proportion within four percentage points with 95% confidence
*Wednesday, May 14, 2014 at 12:50pm*

**statistics**

A test designed to check for sickle-cell anemia has an 85% chance of detection in that, if a person has the disease, there is an 85% chance that the test will be positive. And, if the person does not have the disease, there is an 85% chance that the test will be negative. We ...
*Tuesday, May 13, 2014 at 9:59pm*

**ap stats**

based on over 800 housing prices collected at random from the city of Los Angeles, an investigator constructed a histogram and found that the distribution of housing prices was heavily skewed to the right. Which of the following statistics will best represent the center of ...
*Tuesday, May 13, 2014 at 9:49pm*

**statistics**

An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent. On the other hand, the firm reports that the yearly returns on tax-free municipal bonds are...
*Tuesday, May 13, 2014 at 9:45pm*

**statistics**

A laptop computer manufacturer found that by improving their battery design, they could increase the time that the laptop computer could be used on a single charge. To verify this improvement, they compared a sample of 10 laptops installed with the improved batteries to a ...
*Tuesday, May 13, 2014 at 9:35pm*

**statistics**

Five coins all balanced the same were tossed 150 times. Note that, while the coins are all balanced the same, they may or may not be fair coins. Since five coins were tossed, the possible number of heads for each toss could be zero through five. The following table gives the ...
*Tuesday, May 13, 2014 at 9:18pm*

**business math**

Statistics show that the sales force of a certain company successfully closed 352 sales out of 800 sales calls. What was their percent success rate?
*Monday, May 12, 2014 at 8:11pm*

**Health Information Management Statistics**

In September, the hospital has 23.652 admissions. Of these, 1,569 were readmissions. What is the hospital's readmission rate
*Monday, May 12, 2014 at 2:00pm*

**Statistics**

A brewery's filling machine is adjusted to fill bottles with a mean of 33.8 oz. of ale and a variance of 0.005. Periodically, a bottle is checked and the amount of ale noted. (b) Let's say you buy 93 bottles of this ale for a party. How many bottles would you expect to...
*Monday, May 12, 2014 at 9:58am*

**Statistics**

A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and finds that the number who exercise ...
*Sunday, May 11, 2014 at 1:09am*

**Statistics**

) In a rural area, the infected rate of certain disease is 0.20 (i.e., 20%). A sample of 20 people is taken from the area - selections are independent. Define X as the number of people in the sample who are infected by the disease. (1) This X is a binomial variable. What are ...
*Friday, May 9, 2014 at 1:53pm*

**Statistics**

(25 pts, 5 pts each) The ounces of coffee that a machine dispenses in 5-ounce cups have normally distributed. Suppose a sample of size 6 was taken from this machine, as shown as follows: 5.05 5.03 5.10 5.02 4.98 5.00 (for all calculations, keep at least six decimal places) (1...
*Friday, May 9, 2014 at 1:44pm*

**statistics**

A vending machine company wants to check three of its machines to determine if they are properly dispensing 12 ounces of coffee. Their data is given below. Reference: Ref 11-4 Compute the test value for the coffee machines. Answer 2.25 5.06 6.62 4.86
*Friday, May 9, 2014 at 10:10am*

**Economics & Statistics **

In the least squares equation, Ŷ = 10 + 20X the value of 20 indicates ____________. The Y-intercept increases by 20 units for each unit increase in X That Y increases by 20 units for each unit increase in X That X increases by 20 units for each unit increase in Y The ...
*Thursday, May 8, 2014 at 11:58pm*

**statistics**

8.Jean Siskel is an entertainment analyst for West Coast Securities. He is trying to develop a model to estimate gross earning generated by a new movie release. He has collected the following data on 20 movies: Gross Earnings, Production Costs, Promotion Costs, and if the ...
*Thursday, May 8, 2014 at 9:38pm*

**Statistics**

In the least squares equation, Ŷ = 10 + 20X the value of 20 indicates ____________. The Y-intercept increases by 20 units for each unit increase in X That Y increases by 20 units for each unit increase in X That X increases by 20 units for each unit increase in Y The ...
*Thursday, May 8, 2014 at 6:31pm*

**statistics**

8.Jean Siskel is an entertainment analyst for West Coast Securities. He is trying to develop a model to estimate gross earning generated by a new movie release. He has collected the following data on 20 movies: Gross Earnings, Production Costs, Promotion Costs, and if the ...
*Thursday, May 8, 2014 at 5:01pm*

**statistics**

Plymouth Rock Securities is interested in finding out if there is a relationship between the number of new clients brought into the firm by a broker and the sales performance of the broker. A random sample of 11 brokers' records are reviewed to determine the number of new ...
*Thursday, May 8, 2014 at 4:59pm*

**statistics **

in the spring of 2001, a university had 40,000 registered students. to estimate the percentage of all students expecting to graduate in 4 years, a simple random sample of 225 students was drawn, 144 of the sample planned to graduate in 4 years. (a) were the draws made with or ...
*Thursday, May 8, 2014 at 4:55pm*

**statistics **

3. The personnel director of a corporation will study the overtime work during the previous year for the 2,575 clerical workers. A sample of 100 of these workers will be chosen at random from the files. The average and the standard deviation of the overtime hours will be ...
*Thursday, May 8, 2014 at 3:24pm*

**statistics **

4. John Rengel is the Quality Assurance Supervisor for Vino Supremo Vinyards. He knows that 10 percent of each box of corks is undersized. (6 pts) a) If he were to randomly select 120 corks from the next box, then how many of these corks would John expect to be undersized? b) ...
*Thursday, May 8, 2014 at 3:22pm*

**Math**

I have no idea how to calculate z scores Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable ...
*Thursday, May 8, 2014 at 12:45pm*

**Statistics **

The Jefferson valley bank claims that the variation of their wait time is less when using a single line that feeds three tellers as opposed to having threes peerage lines. Test the claim that the standard deviation for wait time is less than 1.9 minutes with a single feed line...
*Wednesday, May 7, 2014 at 9:54pm*

**statistics**

A student claims the average amount of time spent studying for an exam is less than or equal to 120 minutes. A random sample of 101 students is drawn from a normal distribution. The sample mean is 140 with a sample standard deviation of 20. Test the claim with a .01 level of ...
*Wednesday, May 7, 2014 at 9:48pm*

**Statistics**

A survey of 250 lobster fisherman found that they catch an average of 32 pounds of lobster per day with a standard deviation of four pounds. If a random sample of 30 lobster fisherman is selected, what is the probability that their average catch is less than 31.5 pounds?
*Wednesday, May 7, 2014 at 6:47pm*

**Statistics**

Problem: you work for a manufacturer of tires (average life of your tires is 60.000 km with a standard deviation of 8.000 km). A supplier offers you new material that he says will increase by 10% the mileage of the tires you produce. A) What are the hypotheses for the test you...
*Wednesday, May 7, 2014 at 6:34pm*

**statistics**

A quality supervisor for a factory that makes cell phone cases examines a sample of 46 cases. She finds that 8 cases are the wrong size. Which is the best prediction of the number of cases that will be the wrong size in a shipment of 3,000? A.)410 B.)475 C.)506 D.)522
*Wednesday, May 7, 2014 at 11:31am*

**Statistics (46)**

The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .30. a. How large a ...
*Tuesday, May 6, 2014 at 11:54am*

**Statistics (45)**

In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should ...
*Tuesday, May 6, 2014 at 11:54am*

**Statistics (44)**

The travel-to-work time for residents of the 15 largest cities in the United States is reported in the 2003 Information Please Almanac. Suppose that a preliminary simple random sample of residents of San Francisco is used to develop a planning value of 6.35 minutes for the ...
*Tuesday, May 6, 2014 at 11:53am*

**Statistics (43)**

Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall Street Journal, February 15, 2006). Data (annual consumption in liters) consistent with the findings reported in The Wall Street...
*Tuesday, May 6, 2014 at 11:52am*

**Statistics (42)**

A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. ...
*Tuesday, May 6, 2014 at 11:52am*

**Statistics (41)**

A market research firm conducts telephone surveys with a 42% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the probability that the ...
*Tuesday, May 6, 2014 at 11:50am*

**Statistics (39)**

Suppose a random sample of size 40 is selected from a population with = 9. 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). b. The ...
*Tuesday, May 6, 2014 at 11:49am*

**Statistics (38)**

Many drugs used to treat cancer are expensive. BusinessWeek reported on the cost per treatment of Herceptin, a drug used to treat breast cancer (BusinessWeek, January 30, 2006). Typical treatment costs (in dollars) for Herceptin are provided by a simple random sample of 10 ...
*Tuesday, May 6, 2014 at 11:48am*

**Statistics (37)**

According to the Sleep Foundation, the average night's sleep is 6.8 hours (Fortune, March 20, 2006). Assume the standard deviation is .7 hours and that the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 ...
*Tuesday, May 6, 2014 at 11:47am*

**Statistics (36)**

For borrowers with good credit scores, the mean debt for revolving and installment accounts is $15,015 (BusinessWeek, March 20, 2006). Assume the standard deviation is $3,730 and that debt amounts are normally distributed. a. What is the probability that the debt for a ...
*Tuesday, May 6, 2014 at 11:45am*

**statistics 101 college**

28 randomly picked people were asked if they rented or owned their own home, 20 said they rented. Obtain a point estimate of the proportion of home owners and round the point estimate to the nearest thousandth
*Monday, May 5, 2014 at 11:58pm*

**Statistics**

A student wants to test her hypothesis she gives each of her students an IO test. She finds that the average IQ score is 115 and the standard deviation for the class is 30. There are 22 students in the class. She also knows that the population average IQ is 100 points. Ho:p=...
*Monday, May 5, 2014 at 2:45pm*

**Statistics **

In a study of 200 students, 42 were found to have a GPA greater than 3.0. Find a 98% confidence interval estimate of the proportion, p, of all students that have a GPA greater than 3.0.
*Sunday, May 4, 2014 at 6:58pm*

**Math- Statistics **

An epidemiologist is planning a study on the prevalence of oral contracep- tive use in a certain population. She plans to choose a random sample of n women and to sue the sample proportion of oral contraceptive users (pˆ) as an estimate of the population proportion (p). ...
*Sunday, May 4, 2014 at 5:21pm*

**Statistics**

Dr. Hernandez plans to measure FEV in a random sample of n young women from a certain popu- lation, and to use the sample mean y ̄ as an estimate of the population mean. Let A be the event that Hernandez’s sample mean will be within ±100 ml of the popula- tion...
*Sunday, May 4, 2014 at 5:10pm*

**statistics**

A researcher is interested in whether herbal remedies are effective in relieving allergies, and if so, which ones are most effective. The researcher takes a group of 20 allergy sufferers and randomly assigns each one to receive herbal tea, a homeopathic administration of ...
*Sunday, May 4, 2014 at 4:11pm*

**statistics**

It is known that the population mean for the Quantitative section of the GRE is 500, with a standard deviation of 100. In 2006, a sample of 400 students taking the GRE, whose family income was between $70,000 and $80,000, had a quantitative GRE score of 511. Perform a one-...
*Sunday, May 4, 2014 at 4:02pm*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Sunday, May 4, 2014 at 3:43pm*

**Statistics**

Reginald Brown an inspector from the department of weights and measures, weighs 15 eighteen-ounce cereal boxes of corn flakes. he finds their mean weight to be 17.78 ounces with a standard deviation of .4 ounces. are the cereal boxes lighter than they should be? let Alpha = .01
*Sunday, May 4, 2014 at 3:06pm*

**statistics**

John Davis, a manager of a supermarket, wants to estimate the proportion of customers that will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 3% with 98% confidence?
*Sunday, May 4, 2014 at 2:26pm*

**Statistics**

σ = sqrt[ P * ( 1 - P ) / n ] = sqrt [(0.8 * 0.2) / 100] = sqrt(0.0016) = 0.04 z = (p - P) / σ = (.73 - .80)/0.04 = -1.75. What type of formula is this problem?
*Sunday, May 4, 2014 at 12:47pm*

**statistics**

a medication is 75% effective against a bacterial infection. find the probability that if 12 people take the medication, at least 1 person"s infection will not improve
*Sunday, May 4, 2014 at 10:03am*

**Statistics**

I am a big shot research scientist at Washington University where I am using 2ebrafish to study neuronal migration. My graduate students measured 40 fish and found that the mean length of the fish sampled was 3.7 cm with a standard deviation of 0.5 cm. Construct a 95% ...
*Sunday, May 4, 2014 at 8:49am*

**Statistics **

If I'm sampling 50 people and 35 people liked Pepsi instead of Coke how can i apply that to the test statistics for a mean t=x(bar)-mule/s/ square root n
*Sunday, May 4, 2014 at 4:05am*

**applied statistics**

how to remember the difference between dependent and independent variable and which one is X n Y ?
*Sunday, May 4, 2014 at 2:31am*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Saturday, May 3, 2014 at 9:45pm*

**Statistics**

Im using this equation to complete this question: So for this question, I want to determine how many people like Pepsi and how many people like Coca-Cola. Then I want to determine how many people like X over Y. For example, if 35 out of 50 people prefer Pepsi over Coca-Cola. ...
*Saturday, May 3, 2014 at 8:44pm*

**statistics**

It has been suggested that the rate of forgetting (coded as normal vs. fast) for word lists often used in psychological experiments may depend on the type of memory test employed, either free-recall or recognition. What is the best way to test this hypothesis? a. regression b...
*Saturday, May 3, 2014 at 6:00pm*

**statistics**

17. A newspaper article reported that the typical American family spent an average of $75 for Easter candy last year. A sample of N=16 families this year reported spending a mean of $85, with a standard deviation of $20. What hypothesis testing technique should be used to ...
*Saturday, May 3, 2014 at 5:30pm*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Saturday, May 3, 2014 at 1:56pm*

**statistics**

It has been suggested that the rate of forgetting (coded as normal vs. fast) for word lists often used in psychological experiments may depend on the type of memory test employed, either free-recall or recognition. What is the best way to test this hypothesis? a. regression b...
*Saturday, May 3, 2014 at 12:48pm*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Saturday, May 3, 2014 at 12:41pm*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Friday, May 2, 2014 at 7:09pm*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Friday, May 2, 2014 at 6:21pm*

**statistics**

Table: Like Dogs Yes No Like cats Yes 194 21 No 110 10 For parts a-d give a fraction and % for answer. A.What % of all students like dogs? B. What % of students in the entire class like dogs and cats? C. What % of students who like cats like dogs? D. What % of students who do ...
*Friday, May 2, 2014 at 12:17pm*

**Statistics**

As the sample size gets larger, what happens to the size of the correlation that is needed for significance?
*Friday, May 2, 2014 at 10:29am*

**Statistics - Help!!!**

An independent measures research study compares three treatment conditions using a sample of n=5 in each treatment. For this study, the three samples have SS1=10, SS2=20, SS3= 15. What value would be obtained for MS within?
*Friday, May 2, 2014 at 10:29am*

**statistics**

A research study comparing three treatments with n=5 in each treatment produces T1=5, T2=10, T3=15 with SS1=6, SS2=9, SS3=9 and (Greek letter E)X squared =94. What is SS total? What is SS between and what is SS within?
*Friday, May 2, 2014 at 10:05am*

**statistics**

At the beginning of the semester, students who registered for a statistics course were randomly assigned to two sections, each taught by a different instructor. At the end of the semester, we would like to test whether there are differences in performance on the final exam ...
*Thursday, May 1, 2014 at 9:02pm*

**Statistics **

You want to know if there's a difference between the proportions of high school students and college students who read newspapers regularly. out of a random sample of 500 high-school students, 287 say they read newspapers regularly, and out of a random sample of 420 ...
*Thursday, May 1, 2014 at 11:45am*

**Statistics **

You want to know if there's a difference between the proportions of high school students and college students who read newspapers regularly. out of a random sample of 500 high-school students, 287 say they read newspapers regularly, and out of a random sample of 420 ...
*Thursday, May 1, 2014 at 11:37am*

**Statistics**

Carol has data on the causes of violent outbursts among kindergarten children. She used a "shot-gun" approach to hypothesis testing by asking the computer to produce p-values for 300 quickly chosen hypothesis tests. She shared her glee with fellow researchers, noting...
*Thursday, May 1, 2014 at 8:27am*

**Statistics**

A 95% confidence level for the difference between u1 and u2 runs from -2 to +6. From this we can infer that a. u1 is probably greater than u2. b. u1 is probably less than u2. c. there may be no difference at all between u1 and u2. d. the difference between u1 and u2 is not ...
*Thursday, May 1, 2014 at 8:26am*

**Probability**

We are given the following statistics about the number of children in the families of a small village. There are 100 families: 10 families have no children, 40 families have 1 child each, 30 families have 2 children each, 10 families have 3 each, and 10 families have 4 each. ...
*Thursday, May 1, 2014 at 4:03am*

**statistics**

Chicken Delight claims that 86 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 70 orders revealed that 57 were delivered within the promised time. At the .02 significance level, can we conclude that less than 86 percent of the...
*Wednesday, April 30, 2014 at 9:22pm*

**statistics**

A researcher was interested in assessing the effectiveness of the Statistics Diet as compared to a regular low calorie diet on weight loss. In the study, obese participants were randomly assigned to one of two groups: (1) the Statistics Diet, which required participants to ...
*Wednesday, April 30, 2014 at 9:20pm*

**Statistics 220**

suppose 59 cars start at a car race, how many ways can the top car finish the race?
*Wednesday, April 30, 2014 at 7:43pm*

**Statistics**

A 95% confidence level for the difference between u1 and u2 runs from -2 to +6. From this we can infer that a. u1 is probably greater than u2. b. u1 is probably less than u2. c. there may be no difference at all between u1 and u2. d. the difference between u1 and u2 is not ...
*Wednesday, April 30, 2014 at 7:28pm*

**Statistics**

It is said that healthy and happy workers are efficient and productive. A company that manufactures exercising machines wanted to know the percentage of large companies that provided on-site health club facilities. A sample of 240 companies showed that 96 of them provide such ...
*Wednesday, April 30, 2014 at 7:27pm*

**Statistics**

Carol has data on the causes of violent outbursts among kindergarten children. She used a "shot-gun" approach to hypothesis testing by asking the computer to produce p-values for 300 quickly chosen hypothesis tests. She shared her glee with fellow researchers, noting...
*Wednesday, April 30, 2014 at 7:25pm*

**statistics**

what is the variance and standard deviation of the following numbers:14,16,26,36,12,16
*Wednesday, April 30, 2014 at 3:52pm*

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