Monday

January 26, 2015

January 26, 2015

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics **

Find the to left of z=2.165. Please example how to find on chart
*Monday, January 26, 2015 at 12:35am*

**psychlogical statistics**

A random selection of files from a student counseling center revealed the following reasons why college students seek services: Mental health issues - 25 Learning/school issues - 15 Relationship issues - 5 Other - 5 What is the probability that if we pulled another student ...
*Saturday, January 24, 2015 at 8:56pm*

**statistics**

In a class of 300 students, John’s rank was 40. Find his percentile rank
*Saturday, January 24, 2015 at 1:21pm*

**statistics**

In throwing a pair of dice The event of getting a sum of 5 in the upturned faces of dice.
*Saturday, January 24, 2015 at 6:44am*

**statistics help please**

The employment percentages for men versus women in a computer company last year were 80% and 40%, respectively. At the beginning of this year, they had 150 men and 60 women currently hired. The owner of the company wishes to check their hiring practices and ensure that the ...
*Friday, January 23, 2015 at 7:44pm*

**statistics**

The employment percentages for men versus women in a computer company last year were 80% and 40%, respectively. At the beginning of this year, they had 150 men and 60 women currently hired. The owner of the company wishes to check their hiring practices and ensure that the ...
*Friday, January 23, 2015 at 6:19pm*

**Statistics **

Subtract to find the area to the right of z=1.23: 1-0.8907=?
*Friday, January 23, 2015 at 4:26pm*

**Math (Statistics)**

What causes experimental probability to match theoretical probability?
*Friday, January 23, 2015 at 3:42pm*

**statistics**

suppose a sample of 2404 tenth graders is drawn.Of the sampled, 601 read at or below the eighth grade level. using the data, construct the 98% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level.
*Friday, January 23, 2015 at 1:49pm*

**statistics**

Suppose a large shipment of microwave ovens contained 18% defectives. If a sample of size 228 is selected, what isthe probability that the sample proportion will be greater than 14%? (Round your answer to 4 decimal places)
*Friday, January 23, 2015 at 11:34am*

**Math (Statistics)**

Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
*Friday, January 23, 2015 at 9:18am*

**statistics**

I am trying to figure out how the answer of 0.989 came from the following equation of correlation. 7(-5)-(25)(13) _______________________ /7(127)-(25)*/x/7(71)-(13)*
*Friday, January 23, 2015 at 6:46am*

**Math (Statistics)**

Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
*Thursday, January 22, 2015 at 3:22pm*

**please answer statistics**

Find warranty period (in days) for a washing machine whos average (mean) life is 6 years and standard deviation of 2.5 years. Assume 365 days in a year.
*Thursday, January 22, 2015 at 2:26pm*

**statistics**

Derive one Tail and Two Tail numbers for c = 0.88 or alpha = 0.12.
*Thursday, January 22, 2015 at 2:22pm*

**STATISTICS(PLEASE READ)**

Find warranty period (in days) for a washing machine whos average (mean) life is 6 years and standard deviation of 2.5 years. Assume 365 days in a year.
*Thursday, January 22, 2015 at 2:06pm*

**statistics**

The batting averages of the first three batters in the Eureka College women’s softball team lineup are .310, .301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the group?
*Thursday, January 22, 2015 at 9:03am*

**statistics**

The following is a list of 10 measurements: after adding and sub all 10 numbers I came up with a -29. Now it wants the sum 10/i,i than xi over 32. Do I x -29 and the 32 or do I divide. This is were I get very confused. I am sorry to ask again but I never taken statistic oh I ...
*Wednesday, January 21, 2015 at 7:53pm*

**statistics**

As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables A. age, marital status, and weight are quantitative ...
*Wednesday, January 21, 2015 at 6:53pm*

**statistics**

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
*Wednesday, January 21, 2015 at 2:12pm*

**Statistics**

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
*Wednesday, January 21, 2015 at 11:18am*

**statistics**

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
*Wednesday, January 21, 2015 at 8:15am*

**statistics(please answer!)**

Derive one Tail and Two Tail numbers for c = 0.88 or alpha = 0.12.
*Tuesday, January 20, 2015 at 8:56pm*

**statistics(please answer!)**

find P( t > 5) for DF =2.
*Tuesday, January 20, 2015 at 8:38pm*

**statistics(please answer!)**

find a t score (a) such that P( -a < t < a) = 0.95. Asume sample size n = 10.
*Tuesday, January 20, 2015 at 8:26pm*

**statistics(please answer!)**

Find a t score (a) such that P( -a < t < a) = 0.95. Asume sample size n = 10.
*Tuesday, January 20, 2015 at 8:16pm*

**statistics(please answer!)**

What is the chance of getting 50/% correct on a test with 20 questions, each question is either True or False. Assume you are blindly guessing and answer all questions
*Tuesday, January 20, 2015 at 4:11pm*

**Statistics (Please Please Answer!)**

i bought a vegetable seed pocket containing 20 seeds. A manufacturer label on the pocket said that the seeds have at least 90% germination rate. I planted all 20 seeds following their instructions in preparing soil and water. They told me if an "unlikely event" ...
*Tuesday, January 20, 2015 at 3:59pm*

**statistics(please answer!)**

i bought a vegetable seed pocket containing 20 seeds. A manufacturer label on the pocket said that the seeds have at least 90% germination rate. I planted all 20 seeds following their instructions in preparing soil and water. They told me if an "unlikely event" ...
*Tuesday, January 20, 2015 at 3:13pm*

**Psychology Statistics**

Submit your answers to the following questions using the ANOVA source table below. The table depicts a two-way ANOVA in which gender has two groups (male and female), marital status has three groups (married, single never married, divorced), and the means refer to happiness ...
*Tuesday, January 20, 2015 at 2:53pm*

**statistics**

i bought a vegetable seed pocket containing 20 seeds. A manufacturer label on the pocket said that the seeds have at least 90% germination rate. I planted all 20 seeds following their instructions in preparing soil and water. They told me if an "unlikely event" ...
*Tuesday, January 20, 2015 at 2:00pm*

**statistics**

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
*Tuesday, January 20, 2015 at 12:42pm*

**statistics**

What is the chance of getting 50/% correct on a test with 20 questions, each question is either True or False. Assume you are blindly guessing and answer all questions
*Monday, January 19, 2015 at 7:43pm*

**statistics**

Would it be appropriate to use a random number table to select a digit for each blank square in sudoku
*Monday, January 19, 2015 at 6:34pm*

**statistics**

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 .32. a. How large a ...
*Sunday, January 18, 2015 at 1:40pm*

**Statistics**

A survey or college students collected information on several variables: distance from home, age, major, gender, and class. The variable major is A) neither categorical nor numerical B) categorical C) quantitative Please help :)
*Sunday, January 18, 2015 at 12:47am*

**Statistics**

When ordering vinyl replacement windows, the following variables are specified for each window. Which of these variables is quantitative? A) window style- double hung, casement, or awning B) window style- single pane or double pane C) area of the window opening in square inches
*Sunday, January 18, 2015 at 12:25am*

**Statistics**

An instructor asked students to name their favorite color. An appropriate graph to display the data is a... A) histogram B) pie chart C) time plot
*Sunday, January 18, 2015 at 12:23am*

**math**

• what is statistics • Perspective statistics • inferential statistics • Data statistics • Example of a Quantitative data • Example of a Qualitative data • What is population •what are the different scale of measurement • what are ...
*Saturday, January 17, 2015 at 9:08pm*

**law**

where can I find statistics crime rates in missouri
*Saturday, January 17, 2015 at 6:30pm*

**statistics**

In a class of 100 students, 30 are computer science majors, 49 are mechaincal engineering majors, 13 are civil engineers and the rest are general engineering majors. Assume students only have one major. If a student is chosen at random what is the probability they are: a civil...
*Friday, January 16, 2015 at 9:23pm*

**statistics**

Use the given information to find the minimum sample size required to estimate an unknown population mean μ. How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 99% confidence that the sample mean is within 4 ...
*Friday, January 16, 2015 at 6:05pm*

**statistics**

a statistics instructor collected data on the time it takes the students to complete a test. the test taking time is uniformly distributed within a range of 35 minutes to 55 minutes. determine the standard deviation, what is the probability a particular student will take less ...
*Tuesday, January 13, 2015 at 10:51pm*

**statistics**

Statistics students were asked to go home and fill a 1-cup measure with raisin bran and to tap the cup gently on the counter 3 times to settle the contents. Then, if necessary, add more raisin bran to bring the contents exactly up to the 1-cup line. Once at the 1-cup line, the...
*Tuesday, January 13, 2015 at 6:39pm*

**statistics**

The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
*Monday, January 12, 2015 at 7:55pm*

**Statistics**

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours
*Monday, January 12, 2015 at 7:53pm*

**statistics**

Can you explain how to do this problem The following is a list of 11 measurements: 72, 28, 56, -47, -36, -41, 21, -31, -56, 41, -54 . Suppose that these 11 measurements are respectively labeled x1, x2,...x11 . (Thus,72 is labeled x1 ,28 is labeled x2 and so on.) Find 11 looks ...
*Monday, January 12, 2015 at 6:00pm*

**Statistics**

Can someone help me with this question. I am so very confused. Find the y-intercept of the line whose equation is y=0.7x +6.2. could the answer be 5
*Monday, January 12, 2015 at 2:26pm*

**Statistics **

Did you ever buy an incandescent light bulb that failed (either burned out or did not work) the first time you turned the switch on? When you put a new light bulb into a light fixture, you expect it to light and most of the time it does. Consider 8-packs of 60-watt bulbs and ...
*Monday, January 12, 2015 at 1:24pm*

**Statistics **

The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's home pages is ...
*Monday, January 12, 2015 at 1:16pm*

**Statistics **

A company that produces rivets used by commercial aircraft manufactures knows that the shearing strength (force required to breaking) of its rivets is a major concern. The company believes the shearing strength of its rivets is normally distributed with a mean of 925 lbs and a...
*Monday, January 12, 2015 at 1:12pm*

**statistics**

One of nature's patterns connects the percent of adult birds in a colony that return from the previous year and the number of new adults that join the colony. Following are data for 13 colonies of sparrowhawks: Percent return 73 61 79 54 75 62 53 46 57 50 62 45 35 New ...
*Sunday, January 11, 2015 at 9:33am*

**College Algebra**

According to data from the National Vital Statistics Report, the marriage rate (marriages per 1000) can be described by y=-0.146x+11.074, where x is the number of years after 1980. For what years does this model indicate that the marriage rate was above 9 marriages per 1000? ...
*Thursday, January 8, 2015 at 1:27am*

**Psychological Statistics **

For a population with a mean of 80 and a standard deviation of 12, what is the Z score corresponding to an individual score of 92
*Wednesday, January 7, 2015 at 6:17pm*

**Vocabulary Studies**

Building and construction A. Architecture B. Engineering C. Nursing D. Statistics I think it might be A?
*Tuesday, January 6, 2015 at 12:18pm*

**Statistics**

Evaluate the following. 20 divide 5+8+2x4 Thank you
*Monday, January 5, 2015 at 9:48pm*

**Statistics**

The records of a computer retail store show that out of the 100 customers who purchased a desktop computer last month, 69 also purchased a service plan that extends the warranty for an extra year. Out of the 25 customers who purchased a notebook computer last month, 20 ...
*Monday, January 5, 2015 at 7:15pm*

**Statistics**

If someone could help with this problem so I can understand how to perform the actions. In the past year, Carmen watched 51 movies that she thought were very good. She watched 60 movies over the whole year. Of the movies she watched, what percentage did she think were very ...
*Monday, January 5, 2015 at 3:20pm*

**Statistics**

[(15-8)x3-13]divide 2
*Monday, January 5, 2015 at 1:01pm*

**probability and statistics**

a certain university in the region has a population of 20000 students distributed into 15 courses and four year levels.if you would like to determine the sample size, what technique can be applied
*Sunday, January 4, 2015 at 3:45am*

**Statistics**

A filing machine designed to fill soda bottles with 16 ouncesof soda. The distribution for the weight of the bottles is normal. Twenty bottles are selected and weighted. The sample mean is 15.3 ounces and the standard deviation is 1.5 ounces . Develop a 90% confidence interval...
*Saturday, January 3, 2015 at 4:27am*

**Statistics**

There are 300 students enrolled in Business Statics . Historically,exam scores are normally distributedwith 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 ...
*Saturday, January 3, 2015 at 4:16am*

**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 laons to the fimrs is suspect of the figure and accordingly takes a random samole of 100 accounts of the firm. Find the probability that ...
*Saturday, January 3, 2015 at 3:57am*

**Statistics**

The age of customers for a particular retail store follows a normal distribution with a mean of 37.5 years and a standard deviation of7.6 years.What is the probability that the next customer who enters the store will be less than 42 years old?
*Saturday, January 3, 2015 at 3:28am*

**Statistics**

In 2000,the average charge of tax preparation was $95.Assuming a normal distibution and standard deviation of $10.What proportion of tax preparation fees were more than $95?
*Saturday, January 3, 2015 at 3:20am*

**Math/ Statistics**

The owner of a football team claims that the average attendance at home games is over 3000, and he is therefore justified in moving the team to a city with a larger stadium. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to ...
*Tuesday, December 30, 2014 at 12:17pm*

**Math/ Statistics**

A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the null and alternative hypotheses for the test described. A. H0: µ = 16 ounces Ha: µ < 16 ounces B. H0: µ &...
*Tuesday, December 30, 2014 at 12:09pm*

**Math/ Statistics**

z = 1.8 for Ha: µ > claimed value. What is the P-value for the test? A. 0.9641 B. 3.59 C. 96.41 D. 0.0359
*Tuesday, December 30, 2014 at 12:06pm*

**math**

Describe a situation this week when you used math to solve a problem involving data, graphs and statistics.
*Monday, December 29, 2014 at 10:41am*

**statistics**

There were 50 men and 50 women who were randomly selected from a larger population. •A t-test was conducted to compare men and women’s performance on an assessment after eating chocolate. The results showed an independent t-test value of t .05(99) = 3.43; p < ....
*Monday, December 29, 2014 at 1:25am*

**statistics**

A jar contains 7 red balls, 5 green balls, 4 blue balls, and 3 white balls. A sample of size 7 balls is selected at random without replacement . Find t the probability that sample contains two red balls, 2 green balls, 2 blue balls, and 1 white ball.
*Friday, December 26, 2014 at 5:23am*

**statistics**

interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of . The psychologist randomly selects children from this group and finds that their mean IQ score is . Based on this sample, find a confidence ...
*Sunday, December 21, 2014 at 4:19pm*

**statistics**

Write a correct alternative hypothesis for the claim that the average professional basketball player is at least 6’ 9” tall.
*Friday, December 19, 2014 at 11:54am*

**statistics**

An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the population values are known to be normally distributed and with a population standard deviation of 15. Construct a 90% confidence interval for the mean IQ...
*Thursday, December 18, 2014 at 6:16pm*

**statistics**

find the area under the curve y=3log1.2x between x = 1.2 and x = 3
*Thursday, December 18, 2014 at 5:46am*

**Statistics**

What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when you use each and such.
*Thursday, December 18, 2014 at 5:37am*

**Statistics**

In the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The ...
*Wednesday, December 17, 2014 at 8:15am*

**statistics HELP!**

A data set includes body temperatures of healthy adult humans for which 98.1F and s= 0.56F. What is the best point estimate of the mean body temperature of all healthy humans? Using the sample statistics, construct a confidence interval estimate of the mean body temperature of...
*Tuesday, December 16, 2014 at 6:53pm*

**Statistics**

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, December 16, 2014 at 2:37am*

**statistics**

There are three brands of milk for sale in a supermarket. Let's call them brand A, B, and C. A customer who purchases milk will choose brands A,B, and C with probability 0.6, 0.3, 0.1, respectively. Each day, the toal number of customers who purchase milk at this market ...
*Sunday, December 14, 2014 at 1:15am*

**statistics**

In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 3.8 and...
*Saturday, December 13, 2014 at 2:40pm*

**statistics**

A survey found that women's heights are normally distributed with mean 63.5 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with a mean 68.7 in. and a standard deviation 2.8. (a) Most of the live characters at an ...
*Saturday, December 13, 2014 at 10:05am*

**Statistics**

Use Bayes' theorem to solve this problem. A storeowner purchases stereos from two companies. From Company A, 550 stereos are purchased and 1% are found to be defective. From Company B, 850 stereos are purchased and 6% are found to be defective. Given that a stereo is ...
*Friday, December 12, 2014 at 11:52pm*

**statistics finding the shaded region**

Find the area of the shaded region. The graph depicts the IQ score of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The shaded region numbers are 85-120
*Thursday, December 11, 2014 at 7:08pm*

**statistics probability**

Assume that the thermometer readings are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. The probability of getting a reading between -1.39 degrees C and 1.69 degrees C is ____
*Thursday, December 11, 2014 at 6:38pm*

**statistics**

The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?
*Wednesday, December 10, 2014 at 11:07pm*

**statistics**

candidate #2 received 32% of the votes and candiate #3 received 14% of the votes, WITH a 6 % margin of error. what does this information tell us about the popularity of the candidates? 5
*Wednesday, December 10, 2014 at 12:50pm*

**Statistics**

why is this sentence false. a statistic is an event computed from a population.
*Wednesday, December 10, 2014 at 12:26pm*

**Statistics **

Hello Can you help me It is reported that 72% of working women use computers at work , choose 4 working wonen at random . Find the probability taht : A : all 4 use a computer at their work B : at least one does not use a computer at work Please help me 😞
*Tuesday, December 9, 2014 at 12:50pm*

**Statistics**

A card is selected at random from a standard deck of cards. Find the probability of randomly selecting a king given that an ace has already been selected.
*Tuesday, December 9, 2014 at 12:17pm*

**Statistics**

An ice cream store offers 10 toppings. If no topping is used more than once, in how many different ways can a four topping ice cream dessert be formed?
*Tuesday, December 9, 2014 at 12:16pm*

**fuctions and statistics**

one foot is equivalent to approximately 0.3048 meters. if a building is 65-feet long, what is the length of the building in meters, to the nearest tenth?
*Tuesday, December 9, 2014 at 11:57am*

**Basic Statistics**

The math grades on the final exam varied greatly. Using the scores below, how many scores were within one standard deviation of the mean? How many scores were within two standard deviations of the mean? 99 34 86 57 73 85 91 93 46 96 88 79 68 85 89
*Tuesday, December 9, 2014 at 1:07am*

**statistics**

Suppose you have information that the average stress score of students in online universities is 13.15. Using Minitab, compute a one-sample t-test to find out whether the stress scores reported by your sample are significantly different from those of the population of online ...
*Tuesday, December 9, 2014 at 12:27am*

**Statistics and Probability**

Mallory has a credit score of 680 and she is offered and interest rate of 8.3%. is this a good offer? Explain your answer.
*Monday, December 8, 2014 at 10:38am*

**statistics**

The HIM department has 200,000 active medical records and the department received 12,081 records requests during the year. The QI indicator of the HIM department is Eighty-five percent of records requests will be located within 15 minutes. Of the 12,081 records in the question...
*Sunday, December 7, 2014 at 4:15pm*

**statistics**

the hospital paper filing system contained 20,890 records. A total of 456 were identified as misfiled. What is the filing accuracy rate for the system? What is the percentage of misfiled records?
*Sunday, December 7, 2014 at 3:33pm*

**statistics**

1)According to past record the average daily sales for a sporting goods store was $3456.00. After a new advertising campaign, the manager wants to see if the average daily sales have changed. A random sample of 20 days gives a sample mean of 3655 with a standard deviation of $...
*Saturday, December 6, 2014 at 5:03pm*

**Help with Statistics (T-value and decision rule)**

For a random sample of 12 observations, the sample mean was 407 and the standard deviation was 6. Using the .05 significant level, answer the following questions. What would the t value be? What is the decision rule? **** I think the t-value would be t = -3.0845 Any help would...
*Friday, December 5, 2014 at 8:52pm*

**statistics**

Let x denote the time taken to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at random, what is the probability that this runner will complete this road race in 225 ...
*Friday, December 5, 2014 at 1:50pm*

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