Sunday

January 22, 2017
**math/stats**

Which of the following statements are true? (A) In a two-tail test of hypothesis for a population mean the decision rule is to reject H0 if the test statistic lies outside of the action limits. (B) A statistical test of hypothesis is performed under the assumption that the ...

*Friday, March 27, 2015 by Anonymous*

**statistics**

a local content center reports that it has been experiencing a 15% rate of no shows on advanced reservations. Among 150 advanced reservations find the probability that there will be fewer than 20 no shows round the standard deviation to three decimal to work the problem

*Thursday, March 26, 2015 by Anonymous*

**Business statistics**

5. An Aspirin manufacturer fills bottles by weight rather than by count. Since each bottle should contain 100 tablets, the average weight per tablet should be 5 grains. Each of 100 tablets taken from a large lot is weighed, resulting in a sample average weight per tablet of 4....

*Wednesday, March 25, 2015 by Lizzie*

**Business statistics**

4. A study of the ability of individuals to walk in a straight line (â€œCan We Really Walk Straight?â€, Amer. J. of Physical Anthro., 1992:19-27) reported the accompanying data on cadence (strides per second) for a sample of 20 randomly ...

*Wednesday, March 25, 2015 by Lizzie*

**Business statistics**

3. Determine the t-critical value for a two-sided confidence interval in each of the following situations. a. Confidence level = 95%, df = 15 b. Confidence level = 99%, n = 5. c. Confidence level = 95%, n = 15 d. Significance level = 0.01, df = 37

*Wednesday, March 25, 2015 by Lizzie*

**Business statistics**

2. Each of the following is a large-sample confidence interval for μ, the mean resonance frequency (HZ) for all tennis rackets of a certain type. (114.4, 115.6), (114.1, 115.9) a. What is the value of the sample mean resonance frequency? b. Both intervals were calculated ...

*Wednesday, March 25, 2015 by Lizzie*

**Business statistics**

1. Suppose the estimate of a proportion of a normal population is to be within 0.05 using the 95% confidence level. How large a sample is required if: a. It is known from previous studies that p = 0.3? b. There is no prior knowledge of p?

*Wednesday, March 25, 2015 by Lizzie*

**statistics**

4.The College Boards, which are administered each year to many thousands of high school students, are scored so as to yield a mean of 500 and standard deviation of 100. These scores are close to be normally distributed. a. What percentage of the scores can be expected ... ... ...

*Wednesday, March 25, 2015 by kelli*

**statistics**

A cereal company claims that 2 in every 15 boxes win a prize. What is the probability that you do not win a prize three times in a row?

*Tuesday, March 24, 2015 by Nina*

**Statistics**

The Economic Policy Institute periodically issues reports on wages of entry-level workers. The institute reported that entry-level wages for male college graduates were $21.68 per hour and for female college graduates were $18.80 per hour in 2011 (Economic Policy Institute ...

*Monday, March 23, 2015 by Taylor*

**Probability & Statistics**

To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed. The FDA tests on this cigarette yielded mean nicotine content ...

*Monday, March 23, 2015 by Z*

**Probability and Statistcis**

Students from a statistics class were asked to record their height in inches. The heights ( as recorded) were: 65, 72, 68, 64, 60, 55, 73, 71, 52, 63, 61, 74, 69, 67, 74, 50, 4, 75, 67, 62, 66, 80, 64, 65 Find five number summary.

*Sunday, March 22, 2015 by Anonymous*

**Statistics**

I have a bunch of questions to work on with this specific scenario but I was hoping someone can just help me get started on the first one because I'm having trouble getting started and I'll do the rest on my own.Thanks for any help! In a southern state, it was revealed...

*Sunday, March 22, 2015 by Emily*

**Intro statistics**

A bag contains 7 red, 6 orange, and 9 green jellybeans. What is the probability of reaching into the bag and randomly withdrawing 11 jelly beans such that the number of red ones is 7 the number of orange ones is 1 and the number of green ones is 3?

*Saturday, March 21, 2015 by Anonymous*

**Economics**

China's slowdown Jan 20th 2015, 10:26 by S.R. | SHANGHAI MUCH of the analysis of Chinaâ€™s 2014 GDP data, which the government published today, has focused on the economyâ€™s slowdown That is, on one level, understandable. Growth of 7.4% was...

*Saturday, March 21, 2015 by Remi*

**statistics**

Average entry level salaries for college graduates with mechanical engineering degrees and electrical engineering degrees are believed to be approximately the same. A recruiting office thinks that the average mechanical engineering salary is actually lower than the average ...

*Friday, March 20, 2015 by etoile*

**journalism check answers**

What is satire's underlying goal? to sell newspapers to shock people to get people to think c Many young people today get their news from which of the following unlikely sources? comedy shows such as "The Daily Show" their friends video games B Which of the ...

*Wednesday, March 18, 2015 by jimm*

**statistics**

There is a multiple choice exam with 24 questions, and five options each. If i guess every question, what is the probability that i will get exactly 15 correct.

*Tuesday, March 17, 2015 by ben*

**statistics**

Does a correlation ever prove causation? (For any subject/field?)

*Tuesday, March 17, 2015 by Anonymous*

**statistics**

(10 pts) Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students ...

*Tuesday, March 17, 2015 by lisa*

**Statistics**

What do SEM (standard error of the mean) error bars tell you? How would you describe them in a figure caption for a graph? I know what regular error bars are, but I can't find any information on SEM error bars!

*Tuesday, March 17, 2015 by Jamie*

**Statistics**

A researcher predicts that watching a film on institutionalization will change studentsâ€™ attitudes about chronically mentally ill patients. The researcher randomly selects 36 students, shows them the film, and gives them a questionnaire about their attitudes...

*Monday, March 16, 2015 by Scott*

**statistics**

In a certain lottery, five different numbers between 1 and 31 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same exact order in which they were drawn. What is the probability of winning?

*Monday, March 16, 2015 by Greg*

**statistics**

According to a college survey, 22% of all students work full time. Find the mean and standard deviation for the number of students who work full time in samples of size 16.

*Monday, March 16, 2015 by Hannah*

**statistics**

An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at least one correct answer.

*Monday, March 16, 2015 by Hannah*

**statistics**

The mayor of the town of Quahog, Rhode Island, Adam West, conducted a study to determine the mean household income of his constituents. The study surveyed 500 households and determined that the sample mean was $30,000. The population standard deviation is $4,800. If a ...

*Monday, March 16, 2015 by Cara*

**statistics**

A certain type of dvd player is sold at just two stores. 30% of sales are from store A and 70% of sales are from store B. 2.7% of the dvd players sold at store A are defective while 3.7% of the dvd players sold at store B are defective. If Kate receives one of these dvd ...

*Monday, March 16, 2015 by Amy*

**Business Statistics**

A firm claims that only 10% of it's accounts receivables are over 30 days past due. The bank that supplies working capital or interim loans to the firms is suspect of the figure and accordingly takes a random sample of 100 accounts of the firm. Find the probability that ...

*Monday, March 16, 2015 by Leo Elvis*

**Business Statistics**

A marketing class is engaged in a project to estimate the proportion of homes receiving both HBO and Showtime cable service. The class plans to use a confidence coefficient of 0.95 and a maximum error of the estimate equal to 0.10. Determine the sample size for the class to use.

*Monday, March 16, 2015 by Leo Elvis*

**Business Statistics**

A filling machine is designed to fill soda bottles with 16 ounces of soda. The distribution for the weight of the bottles is normal. Twenty bottles are selected and weighed. The sample mean is 15.3 ounces and sample standard deviation is 1.5 ounces. Develop a 90% confidence ...

*Monday, March 16, 2015 by Leo Elvis*

**Business Statistics**

There are 300 students enrolled in Business Statistic. Historically, exam scores are normally distributed with a standard deviation of 30.9. Your instructor randomly selected a sample of 30 examinations and finds a mean of 74.2. Determine a 90% confidence interval for the mean...

*Monday, March 16, 2015 by Leo Elvis*

**Statistics**

The average SAT score for the 300 students accepted at Tiny College this year is 1,050 with a standard deviation of 275. If a random sample of 40 students is selected from this class, what is the probability that the average SAT score will be greater than 1,000?

*Monday, March 16, 2015 by Leo Elvis*

**Statistics**

A firm claims that only 10% of its accounts receivables are over 30 days past due. The bank that supplies working capital or interim loans to the firm is suspect of the figure and accordingly takes a random of 100 accounts of the firm. Find probability that the sample ...

*Monday, March 16, 2015 by Leo Elvis*

**Statistics**

The time it takes a technician to fix a computer problem is exponentially distributed with a mean of 15 minutes. what is the probability that a). it will take a technician less than 10 minutes to fix a computer problem? b) it will take a technician between 10 to 15 minutes to ...

*Sunday, March 15, 2015 by Leo Elvis*

**Statistics**

the age of costumers for a particular retail store follows a normal distribution with a mean of 37.5 years and a standard deviation of 7.6 years. what is the probability that the next costumer who enters the store will be less than 42 years old?

*Sunday, March 15, 2015 by Leo Elvis*

**Statistics**

in 2000, the averages change of tax preparation was $95. Assuming a normal distribution and a standard deviation of $10. What proportion of tax preparation fees were more than $95.

*Sunday, March 15, 2015 by Leo Elvis*

**Statistics**

How many different ways can you put 3 distinguishable things in 10 boxes?

*Saturday, March 14, 2015 by Bob*

**statistics**

A credit card company estimates that the average credit card balance of Americans is $3,210. A statistics student wants to know whether this is true for citizens of her home town. Which hypothesis test would be most appropriate for addressing this question? One sample z-test ...

*Saturday, March 14, 2015 by madi*

**statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 395 babies were born, and 316 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, ...

*Friday, March 13, 2015 by slomomo*

**Statistics**

80. Florida State University has 14 statistics classes scheduled for its Summer 2013 term. One class has space available for 30 students, eight classes have space for 60 students, one class has space for 70 students, and four classes have space for 100 students. a. What is the...

*Friday, March 13, 2015 by Howard*

**Statistics - Can anybody help me?**

A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream. Q: What was the Origional dose of the medicine? ________ milligrams. Q How long...

*Friday, March 13, 2015 by Cindy*

**Statistics**

A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream. Q: What was the Origional dose of the medicine? ________ milligrams. Q How long...

*Friday, March 13, 2015 by Cindy*

**Statistics**

Good Afternoon, Hope everyone will have a nice weekend. I am sorry to bother you all, but I am failing statistic. Can someone give me an example of this and example of a regression hypothesis. Thank you

*Friday, March 13, 2015 by mary ann*

**statistics/probability**

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 181 lb. The new population of pilots has normally distributed weights with a mean of 135 and a standard deviation of 25.1 lb. If a pilot is randomly ...

*Thursday, March 12, 2015 by slomomo*

**statistics**

The mean (μ) of the scale is 83 and the standard deviation (σ) is 10. Assuming that the scores are normally distributed, what is the PROBABILITY that a score falls below 72?

*Thursday, March 12, 2015 by chris*

**statistics**

The average age of doctors in certain hospital is 43 years old. Suppose distribution of ages is normal and the standard deviation is 8.0 years. If 25 doctors is chosen at random for a committee, find the probability the average age for those doctors is less than 43.8 years. ...

*Wednesday, March 11, 2015 by stuart joel*

**statistics**

A casting director wishes to find one male and one female to cast is his play. If he plans to audition 5 males and 7 females, in how many different ways can this be done? DO NOT put a comma in your response.

*Wednesday, March 11, 2015 by jesse*

**Statistics**

Shopping Outlet A shopping outlet estimates the probability distribution of the number of stores shoppers actually enter as shown in the table below. x 0 1 2 3 4 p(x) 0.05 0.35 0.25 0.20 0.15 What is the probability that shoppers are just window shopping and not entering any ...

*Wednesday, March 11, 2015 by Anon*

**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 87% of children at risk. A concerted ...

*Tuesday, March 10, 2015 by Leatha*

**Elementary Statistics**

"Scores on the Wechsler IQ test approximate a normal curve with a mean of 100 and a standard deviation of 15. b. What percentage of IQ scores are below 74?" I've been working at this for a while now, but when I solve for the z-score, I keep getting a negative ...

*Tuesday, March 10, 2015 by Nicole*

**statistics**

Z-test. How to find critical value for one tail test?

*Tuesday, March 10, 2015 by Anonymous*

**statistics - can someone please Help me**

I have tried for days to figure out how to work this problem. Please help show me how to find the answer. A particular radioactive isotope decays from 210 mg to 182.7 mg in 15 days. Find the half life of the isotope. I can not find any problem that is similar. everything i ...

*Tuesday, March 10, 2015 by Tina*

**statistics**

How to find p value? If test statistic is -0.37, will the p value be 0.3557?

*Tuesday, March 10, 2015 by Anonymous*

**statistics**

I have tried for days to figure out how to work this problem. Please help show me how to find the answer. A particular radioactive isotope decays from 210 mg to 182.7 mg in 15 days. Find the half life of the isotope.

*Tuesday, March 10, 2015 by Tina*

**statistics**

A jar contains 3 nickels and 2 dimes. You reach in and randomly select 2 coins. Let x represent the value of the two coins in cents. Find the expected value and standard deviation of x

*Tuesday, March 10, 2015 by Ashley*

**statistics**

Determine whether the description corresponds to an observational study or an experiment. Research is conducted to determine if there is a relation between kidney function in adults and childhood-onset diabetes.

*Tuesday, March 10, 2015 by slomomo*

**statistics**

Based on a study of IQs of men and women who play chess competitively, a researcher concludes that playing chess causes people to become smarter. Do you agree with this conclusion?

*Tuesday, March 10, 2015 by slomomo*

**Statistics**

A history class is comprised of 5 female and 8 male students. If the instructor of the class randomly chooses 8 students from the class for an oral exam, what is the probability that 2 female students and 6 male students will be selected? Round your answer to decimal places.

*Tuesday, March 10, 2015 by Ryan*

**problem and statistics**

In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. X is the minutes studied, and Y is the test score. x : {20,30,45,60,80,90,45,120,90,70} y: {50,45,55,70,80,90,80,100,95,85} Is this ...

*Monday, March 9, 2015 by Zikera*

**statistics**

An online site presented this question, 'Would the recent norovirus outbreak deter you from taking a cruise?' Among 34,327 people who responded, 66% answered 'yes'. Use the sample data to construct a 95% confidence interval estimate for the proportion of the ...

*Monday, March 9, 2015 by slomomo*

**Statistics**

In the week before and the week after a holiday, there were 12,000 total deaths, and 5916 of them occurred in the week before the holiday. a. Construct a 95% confidence interval estimate of the proportion of deaths in the week before the holiday to the total deaths in the week...

*Monday, March 9, 2015 by slomomo*

**Healthcare Statistics**

As a data collection specialist at the National Institutes of Health (NIH), you have been involved in a research study conducted over the past year. The study found that liver cancer rates per 100,000 males among cigarette smokers to nonsnmokers, in a major urban U.S. city, ...

*Sunday, March 8, 2015 by Nancy*

**Statistics**

What does p-hat mean

*Sunday, March 8, 2015 by slomomo*

**Statistics**

If a mother has three bananas, two pears, and two oranges, in how many different ways can she give the fruit to her daughter in one week, one piece of fruit per day?

*Saturday, March 7, 2015 by Jenifer*

**statistics**

In the population, the average IQ is μ = 100 with a standard deviation of σ = 15. A team of scientists wants to test a new medication to see if it has a positive effect on intelligence. A sample of n = 10 participants who have taken the medication has a mean of M = ...

*Saturday, March 7, 2015 by sam*

**statistics**

I need help, I am trying to figure out the critical value of my homework and I am having a great deal of trouble. if z= 1.69 p = .0455 What is the critical value(s) , is/are z =?

*Saturday, March 7, 2015 by phyllys*

**statistics**

The mean cost of domestic airfares in the United states rose to an all-time high of $385 per ticket

*Saturday, March 7, 2015 by spha*

**Business Statistics**

The following tables shows the hourly wages of all workers in a certain hospital. Determine the pearsonian coefficient of skewness (population data). Hourly wages frequency 90-99 5 100-109 9 110-119 5 120-129 7 130-139 5 140-149 3 My answers: mean = 116.56 s = 15.72 But i don...

*Saturday, March 7, 2015 by rianne*

**statistics**

A coin mint has a specification that a particular coin has a mean weight of 2.5 g. A sample of 39 coins was collected. Those coins have a mean weight of 2.49491 g and a standard deviation of 0.01372 g. Use a 0.05 significance level to test the claim that this sample is from a ...

*Saturday, March 7, 2015 by slomomo*

**statistics**

Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.876 and the regression line is y-hat = 11,76 + 0.89x, where x represents the IQ score of the twin born second. Also,the 20x values have a mean of ...

*Saturday, March 7, 2015 by slomomo*

**math/statistics**

The data show the time intervals after an eruption (to the next eruption) of a certain geyser. Find the regression equation,letting the first variable be the independent (x) variable. Find the best predicated time of the interval after an eruption given that the current ...

*Friday, March 6, 2015 by slomomo*

**Statistics**

Identify the type I error and type II error that corresponds to the given hypothesis. The proportion of settled medical malpractice suits is 0.28 I have been working on this one for 3 hours and am doing something wrong, Please help!!

*Friday, March 6, 2015 by slomomo*

**statistics**

For an IQ test, we know the population mean = 100 and the standard deviation =16. We are interested in creating the sampling distribution when N = 64. (a) What does that sampling distribution of means show? (b) What is the shape of the distribution of IQ means and the mean of ...

*Friday, March 6, 2015 by amanda*

**Statistics**

If bird flu mortality in one sample of 100 is 20% and in another sample of 100 it is 30%. Is the difference in mortality rate is significant? Solve for the statistic value of Z at probability alpha level of 0.05. Please show your solution.

*Friday, March 6, 2015 by Jolina Marie Pedron*

**statistics**

A survey found that women's heights are normally distributed with mean 62.4 in and standard deviation 2.8 in. The survey also found that men's heights are normally distributed with a mean of 68.9 in. and standard deviation 2.8. Complete parts a through c below. a. Most...

*Thursday, March 5, 2015 by slomomo*

**Statistics/Probability**

A certain brand of candies have a mean weigh of 0.8576 g and a standard deviation of 0.0523. A sample of these candies came from a package containing 447 candies,and the package label stated the net weight is 381.3 g. (If every package has 447 candies, the mean weight of the ...

*Thursday, March 5, 2015 by slomomo*

**Statistics/Probability**

Assume that womenâ€™s heights are normally distributed with a mean given by μ = 63.4 in, and a standard deviation given by σ = 2.3 in. (a) If 1 woman is randomly selected, find the probability that her height is less than 64 in. (b) If 43 women are ...

*Wednesday, March 4, 2015 by slomomo*

**statistics/normal distribution**

Find the area of the shaded region.The graph to the right depicts IQ scores of Adults (85-120), and those scores are normally distributed with a mean of 100 and a standard deviation of 15

*Wednesday, March 4, 2015 by slomomo*

**Statistics Help**

Express the confidence interval (0.024, 0.112) in the form of p-hat â€“ E < p < p-hat + E = __< p < __ I don't understand how to perform this formula. Please help I am about to graduate and this is my last class, and I am struggling as I only ...

*Wednesday, March 4, 2015 by slomomo*

**statistics/Help Please!!**

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained:0.18, 0.12, 0.05, 0.19, 0.18,0.13, 0.15. Assuming that this sample is representative of the cars in use, construct a 98% confidence interval ...

*Wednesday, March 4, 2015 by slomomo*

**statistics**

one bag contains 4 white balls,2 black balls.another bag contains 3 white balls 5 black balls.if one ball is drawn from each bag. find that a) both are white? b) both are black? c)one is white and one is black?

*Wednesday, March 4, 2015 by sagar*

**Statistics**

. Given that x is a normal variable with mean m=110 and standard divation (r=12, find P(x=≤120

*Wednesday, March 4, 2015 by Venita*

**Statistics**

A random sample of state gasoline taxes is shown for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 0.21? assume normal distribution.

*Tuesday, March 3, 2015 by Say*

**Statistics**

find the probability that you will get a "sum" of 5 or greater in rolling two dice experiment. How do you do this?

*Tuesday, March 3, 2015 by Tamera*

**businessmath**

Statistics show that the sales force of a certain company successfully closed 986 sales out of 1,700 sales calls. What was their percent success rate? If needed, enter decimals rather than fractions. Do not enter the percent symbol in your answer.i need the answer now

*Tuesday, March 3, 2015 by babysunshine*

**Statistics**

so we will be having a quiz about hypotheses testing and i cant still figure out the difference between the null hypothesis with alternative hypothesis. PLEASE HELP ME DIFFERENTIATE THE TWO. And i still get confused between one tailed test and two tailed test.. what's the ...

*Tuesday, March 3, 2015 by Ngiti*

**Statistics**

what is the cost of a dinner when there is a 0 rating when y hat=1.6+2.9x

*Monday, March 2, 2015 by Mark*

**Statistics**

How does the standard deviation differ to of the sample mean x bar. Please help I'm confused

*Monday, March 2, 2015 by Sam*

**statistics**

The life spans of three randomly selected tires are 28,100 miles, 37,900 miles, and 33,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.

*Sunday, March 1, 2015 by Anonymous*

**statistics**

Fewer young people are driving. In 1983, 87 percent of 19 year-olds had a driver's license. Twenty-five years later that percentage had dropped to 75 percent (University of Michigan Transportation Research Institute website, April 7, 2012). Suppose these results are based ...

*Sunday, March 1, 2015 by soni*

**statistics**

In a test of the effectiveness of garlic for lowering cholesterol, 44 subjects were treated with garic in a processed tablet form. Cholesorol levels were measured before and after the treament. the changes in their levels of LDL cholestorol (in mg/dL have a mean of 3.5 and a ...

*Sunday, March 1, 2015 by slomomo*

**Statistics/check answer**

If a population has a standard deviation σ of 18.2 units, what is the standard error of the mean if samples of size 25 are selected? Show all work. standard error of the mean = 0/sqrt(n) = 18.2/sqrt(25) = 18.2/5 =3.64 Answer 3.64

*Sunday, March 1, 2015 by slomomo*

**statistics**

Suppose for the same 3000 women, we also measured their weight. Suppose the data were again normally distributed. The average weight is 143 lbs., and the standard deviation is 30 lbs. Suppose the correlation between height and weight is r = +.69. What is the slope of the best-...

*Sunday, March 1, 2015 by marie*

**Statistics**

Suppose that the distance of fly balls hit to the outfield (in baseball)is normally distributed with a mean of 250 feet and a standard deviation of50 feet. a. If X = distance in feet for a fly ball, then X ~ _____(_____,_____) b. If one fly ball is randomly chosen from this ...

*Sunday, March 1, 2015 by Gail*

**Statistics**

How many different 9 letter code words can be made using the symbols %%%% &&& ++

*Sunday, March 1, 2015 by Anonymous*

**Statistics**

Science scores for high school seniors in the United States are normally distributed with a mean of 78 and a standard deviation of 10. Students scoring in the top 10% are eligible for a special prize consisting of a laptop and $2,000. What is the approximate cutoff score a ...

*Saturday, February 28, 2015 by JOE*

**statistics**

how to summarize statistic assumption

*Saturday, February 28, 2015 by blue*

**statistics**

If weight in the general population is normally distributed with an average of 160 and a standard deviation of 20 pounds, what is the probability of selecting someone who weights 120 or less or 170 or more pounds?

*Friday, February 27, 2015 by candy*

**statistics**

Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation: z(α/2) = 1.96

*Friday, February 27, 2015 by slomomo*

**Statistics**

With a known population mean of 100, and a known standard of error of the mean of 7.5, what is the probability of selecting at random a sample whose mean is equal to 110 or greater?

*Friday, February 27, 2015 by Veronica*