Wednesday

May 27, 2015

May 27, 2015

**statistics**

The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 22 13 35 Total 41 34 75 Q: If 100 children are chosen at random, it would be unusual if more ...
*Tuesday, August 19, 2014 at 11:54am*

**statistics**

Construct the cost of living index number for private university teacher for the year august 2014 considering august 2013 as the base period.
*Tuesday, August 19, 2014 at 1:37am*

**statistics**

If a milk cow in California produced a mean of 1,875 pounds of milk per month, what percentage of production would that cow be in compared to the overall production per milk cow in California from 1990 through 2005?
*Tuesday, August 19, 2014 at 12:57am*

**statistics**

population has mean 53 and standard deviation 12. Calculate the standard deviation of x bar for a random sample of size 12.
*Monday, August 18, 2014 at 7:12pm*

**statistics**

The number of hours that college students sleep on a week night is approximated by a normal curve with a mean of 7 hours and a standard deviation of 1.7 hours. Answer the question below using a z table: On a week night, what percentage of students sleep between 5 and 10 hours
*Monday, August 18, 2014 at 9:27am*

**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?
*Sunday, August 17, 2014 at 11:16pm*

**Statistics in Psychology**

What is a proper Null and Alternative HypothesThe CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study ...
*Sunday, August 17, 2014 at 7:12pm*

**Statistics**

The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
*Sunday, August 17, 2014 at 6:40pm*

**statistics**

In performing a hypothesis test, the null hypothesis is population mean = 6.9 and the alternative hypothesis is population mean ≠ 6.9, a random sample of 16 items is selected. The sample mean is 7.1 and the sample standard deviation is 2.0. The population is ...
*Sunday, August 17, 2014 at 8:09am*

**Research Statistics**

The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
*Saturday, August 16, 2014 at 1:29am*

**Statistics**

Six homes are randomly surveyed from a group of fifteen homes. How many different random samples are possible
*Thursday, August 14, 2014 at 3:15am*

**statistics**

4. The average family income in the town of Seneville is $45 000, with a standard deviation of $9000. Assuming that family income is normally distributed, determine the income level below which 80% of the families in this town earn
*Wednesday, August 13, 2014 at 8:28pm*

**statistics**

You want to estimate the difference in grade point averages between two groups of university students to be accurate within 0.2 grade point, with probability approximately equal to 0.95. If the standard deviation of the grade point measurements is approximately equal to 0.6, ...
*Wednesday, August 13, 2014 at 2:43pm*

**statistics**

in a beach side suburb it rains on 20% of days and is windy on 30% of days. if rain and wind are independent, on any particular day find the probability that: (a) it rains and is windy (b) it does not rain and is not windy (c) it rains or it windy (d) it does not rain or is ...
*Wednesday, August 13, 2014 at 12:28pm*

**statistics**

1) One hundred clients of a registered tax agent fall into the categories of personal (25 male, 30 female), corporate (10 male, 15 female) and small business (8 male, 12 female). The agent selects one of the clients at random to begin work. Find the probability that the client...
*Wednesday, August 13, 2014 at 11:33am*

**statistics**

A research organization claims that the monthly wages of industrial workers in district X exceeds that of those in district Y by more than Rs 150. Two different samples drawn independently from the two district yielded the following results: District X: 1 x = 648, 2 1 s = 120...
*Wednesday, August 13, 2014 at 9:21am*

**statistics**

150 students is 60 kg the mean of body is 70 kg withstandard deviation of 10 kg and mean weight of girls is 55 kg with standard deviation of 15kg.calculate the number of boys and the combined standard deviation. Also find whether the coefficient of deviation is hired for girls...
*Monday, August 11, 2014 at 3:51pm*

**statistics**

Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of someone clicking on an ad solely for the purpose ...
*Monday, August 11, 2014 at 1:58am*

**statistics**

Use the given sorted values below which are the numbers of points scored in the Super Bowl for a recent period of 24 years. 36 37 37 39 39 41 43 44 44 47 50 53 54 55 56 56 57 59 61 61 65 69 69 75
*Sunday, August 10, 2014 at 10:34pm*

**statistics**

Suppose that on a certain examination in advanced mathematics, students from University A achieve scores which are normally distributed with a mean of 625 and a variance of 100, and that students from University B achieve scores which are normally distributed with a mean of ...
*Sunday, August 10, 2014 at 6:59am*

**Statistics**

I need to perform a One Way Anova for the following numbers: Scores: are 1, 2, 3, 2,3,4,4,5,6 Group: are 1, 1, 1, 2,2,2,3,3,3 How do I do this? I have the format but I don't know what numbers to put in for the samples,
*Saturday, August 9, 2014 at 3:20pm*

**statistics**

A jar contains 2 red balls, 2 blue balls, 2 green balls and 1 orange ball. Balls are randomly selected, without replacement, until 2 of the same colour are obtained. Calculate the probability that more than 3 balls must be selected.
*Thursday, August 7, 2014 at 12:13pm*

**statistics **

The mean sleep time of babies is 14hrs,a sample of 64 babies showed a mean of 13hrs 30min with a standard deviation of 3hrs at 1% level of significance. Test the assertion that the mean sleep of the babies is less than 14hrs a day.
*Thursday, August 7, 2014 at 12:02pm*

**statistics **

The mean lifetime of a sample of 100 light tubes is 1570 hours with a standard deviation of 80 hours test the hypothesis that the mean lifetime of the tubes is 1600 hours
*Thursday, August 7, 2014 at 11:34am*

**sTATISTICS**

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, approximately what percentage of light bulbs has a life of more than 3000 hours?
*Thursday, August 7, 2014 at 4:40am*

**statistics**

Suppose x is a uniform random variable with c=10 and d=60. Find the probability that a randomly selected observation exceeds 30.
*Wednesday, August 6, 2014 at 9:07pm*

**statistics**

You can answer any questions from the questions on an exam. In how many different ways can you choose the questions, assuming that the order in which you choose the questions is irrelevant?
*Wednesday, August 6, 2014 at 7:25pm*

**Psyc, statistics**

Introduction to Hypothesis Testing In an article entitled “Science and ethics in conducting, analyzing, and reporting psychological research” in the journal Psychological Science (1994), psychologist Robert Rosenthal examines the relationship between a researcher&#...
*Wednesday, August 6, 2014 at 5:41pm*

**statistics**

If 1,000 students take a test that has a mean of 40 minutes, a standard deviation of 8 minutes, and is normally distributed, how many would you expect would finish in between 24 and 48 minutes?
*Wednesday, August 6, 2014 at 11:16am*

**Statistics**

Suppose that you are designing an instrument panel for a large industrial machine. The machine requires the person using it to reach 2 feet from a particular position. The reach from this position for adult women is known to have a mean of 2.8 feet with a standard deviation of...
*Tuesday, August 5, 2014 at 1:59am*

**statistics**

The students in your class with three children in their families are asked to state the number of boys in the family. What are the possible numbers? If X is the number of boys minus the number of girls in each of these families, state all the possible values of X. Make a table...
*Monday, August 4, 2014 at 11:52pm*

**statistics**

Kindergarten children have heights that are approximately distributed normal. A random sample of size 20 is taken and the mean x and the standard deviation s are calculated ( x = 40 inches and s = 3). a. Is there sufficient evidence to indicate that the mean of kindergarten ...
*Sunday, August 3, 2014 at 6:52pm*

**statistics**

The human resources department of an engineering company gives IQ tests to a randomly selected group of new hires every year. They claimed that the mean IQ score of new hires, , from this year is greater than or equal to the mean IQ score of new hires, , from last year. This ...
*Sunday, August 3, 2014 at 4:01pm*

**statistics**

DO I NEED TO USE 2-TAILED OR 2-TAILED RESULTS? WHY? A researcher believed that 2 hours per week of intensive exercise would result in significant weight loss after 12 weeks on the schedule. Accordingly, he weighed a group of 50 subjects before and after the 12 week exercise ...
*Sunday, August 3, 2014 at 11:32am*

**statistics**

1. A class of 10 students all received a 90 on the final exam. What is the standard deviation?_________
*Sunday, August 3, 2014 at 11:20am*

**statistics**

The trends in international mathematic and science study (TIMSS) in 2007 examined eighth grade proficiency in math and science. The mean mathematics scale score for the sample of eighth grade students in the US was 508.5 with a standard error of 2.83. Construct a 95% ...
*Saturday, August 2, 2014 at 7:14pm*

**statistics**

Salaries for various positions can vary significantly depending on whether or not the company is in the public or private sector. The U.S. department of labor posted the 2007 mean salary for human resource managers employed by the federal government, as &76, 503. Assume the ...
*Saturday, August 2, 2014 at 1:01pm*

**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*