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July 31, 2014

July 31, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics**

A random sample of 10 independent observations from a normally distributed population yielded the following values 51, 53, 49, 43, 47, 46, 45, 30, 60, 52. a) Estimate the standard deviation of the sampling distribution of means for samples like this one. b) Using á = ....
*Sunday, May 5, 2013 at 2:25pm*

**statistics**

The attendance at the school play on Friday was 95% of the attendance on Saturday night. If 203 people attended on Saturday night, estimate how many attended on Friday night. a minute agoEdit Question
*Sunday, May 5, 2013 at 9:58am*

**life orientation**

1.Identify and describe 3environment health hazards that cause ill health,crises and or disasters within your community or any other community within south africa and globaLly.include evidence that is current of the identifted issues.use graphs,statistics,pictures. 2....
*Sunday, May 5, 2013 at 5:56am*

**statistics**

the percent defective for parts produced by a manufacturing process is targeted at 4%. The process is monitored daily by taking samples of sizes n=160 units. Suppose that today's sample contains 14 defectives. How many units would have to be sampled to be 95% confident ...
*Saturday, May 4, 2013 at 4:47pm*

**Statistics**

A certain lottery is won by selecting the correct four numbers from 1,2....30. The probability of winning if the rules are changed so that in addition to selecting the correct four numbers you must now select them in the same order as they are drawn?
*Saturday, May 4, 2013 at 3:37pm*

**Statistics**

The world’s smallest mammal is the bumblebee bat. Such bats are roughly the same size of a large bumblebee. Listed below are the weights (in grams) from a sample of these bats. Assuming that all such bats have a standard deviation of .3 grams, use a significance level of...
*Saturday, May 4, 2013 at 1:21pm*

**statistics**

A manufacturing company produces 10,000 plastic glasses per week. This company supplies plastic glasses to another company, which packages the glasses as part of picnic sets. The second company randomly samples 10 glasses from the supplier. If at least eight of the sampled ...
*Saturday, May 4, 2013 at 3:26am*

**Statistics**

The Education Testing Service conducted a study to investigate differences between the scores of males and females on the SAT. The study identified a random sample of 562 females and 852 males that had achieved the same high score on the math portion of the test. That is, both...
*Friday, May 3, 2013 at 10:40pm*

**statistics**

A firm having 4000 employees took a random sample of 25 in order to estimate their average annual state tax payment with 99% confidence. If the results were X = $640 and s = $20, what is the best interval estimation?
*Friday, May 3, 2013 at 10:37pm*

**Statistics**

For questions 1-5, write the null and alternative hypothesis. 1. Does the water temperature have an effect on the number of people in the pool? 2. Does the weather have an effect on the number of people at the beach? 3. A fitness center is running a discounted membership fee. ...
*Friday, May 3, 2013 at 11:47am*

**Statistics**

1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...
*Friday, May 3, 2013 at 11:45am*

**statistics**

400 draws are made at random with replacement from 5 tickets that are marked -2, -1, 0, 1, and 2 respectively. Find the expected value of: 1. the number of times positive numbers appear 2. the sum of all the numbers drawn 3. the sum of the positive numbers drawn
*Friday, May 3, 2013 at 4:34am*

**Statistics**

One of your friends is comparing yeast fermentation rates when yeast is grown in a solution containing glucose (G) and when grown in a solution containing starch (S). The friend starts with no expectations about which feeding medium will give higher yields but after seeing the...
*Friday, May 3, 2013 at 3:39am*

**Statistics**

In planning a study of the birth weights of babies whose mothers did not see a doctor while pregnant, a researcher writes the hypotheses as H0: x̄ = 2250 grams versus H1: x̄ < 2250 grams. What is wrong with this?
*Friday, May 3, 2013 at 3:37am*

**statistics**

A sample survey interviews an SRS of 263 college women. Suppose (as is roughly true) that 75% of all college women have been on a diet within the past 12 months. Using the Normal approximation, what is the probability (±0.001) that 82% or more of the women in the sample...
*Thursday, May 2, 2013 at 10:48pm*

**statistics**

Linda Silbers is a social scientist studying voter opinion about a city bond proposal for a light rail mass transit system in Denver If Linda wants to be 90 percent Confident that her sample estimate of the proportion of voters who favor the bond is within 2 percent of the ...
*Thursday, May 2, 2013 at 9:35pm*

**Statistics**

Assuming that the heights of college women are normally distributed with mean 66 inches and standard deviation 2 inches, what percentage of women are shorter than 72 inches?
*Thursday, May 2, 2013 at 5:39pm*

**statistics**

researcher wants to know if state quarters have a weight that is mor than traditional quarters. he selected 18 state quarters and 16 traditional, weighed each of them and recorded data. test the claim that state quarters have a mean weight that is more than traditional ...
*Wednesday, May 1, 2013 at 11:52pm*

**statistics**

Paul received a score of 80 on a history test for which the class mean was 70 with a standard deviation of 10. He received a score of 75 on a biology test for which the class mean was 70 and the standard deviation was 2.5. On which test did he do better relative to the rest of...
*Wednesday, May 1, 2013 at 10:25pm*

**Statistics**

Use the sample data and confidence level to construct the confidence interval estimate of the population p....n=5200, x=4821, 99% confidence
*Wednesday, May 1, 2013 at 9:51pm*

**statistics**

In a survey of 1,000 people, 520 are opposed to the tax increase. Construct a 95% confidence interval for the proportion of those people opposed to the tax increase.
*Wednesday, May 1, 2013 at 9:54am*

**Statistics :(**

I have like 9 more of these problems, can someone please help me out so I can get started. thanx JS In a random sample of 35 tractors, the annual cost of maintenance was $4,425 and the standard deviation was $775. Construct a 90% confidence interval for this. Assume the annual...
*Wednesday, May 1, 2013 at 8:56am*

**Statistics**

In a sample of 77 widgets, 6 were defective. How many defective widgets would you expect in a sample of 616 widgets?
*Tuesday, April 30, 2013 at 3:53pm*

**Probability & Statistics**

Charmaine is looking at the rental car prices for Get You There Rental Car Company. The cost is based on how many miles you plan to drive the rental car. Use the list of rental prices to answer the questions 1- 5. Miles Cost 200 $80 600 $120 1000 $160 1400 $200 1800 $320 1) ...
*Tuesday, April 30, 2013 at 3:18pm*

**Probability & Statistics**

Charmaine is looking at the rental car prices for Get You There Rental Car Company. The cost is based on how many miles you plan to drive the rental car. Use the list of rental prices to answer the questions 1- 5. Miles Cost 200 $80 600 $120 1000 $160 1400 $200 1800 $320 1) ...
*Tuesday, April 30, 2013 at 3:16pm*

**Math - Intro to Statistics (High School)**

The average square footage in an apartment in a town is 1,800 square feet with a standard deviation of 120 square feet. The square footage is normally distributed. You randomly select 10 apartments in the town. What is the probability that the mean will be more than 1900 ...
*Tuesday, April 30, 2013 at 12:10pm*

**Statistics**

A study of 420,048 cell phone users found that 135 of them developed cancer of the brain or nervous system. prior to this study of cell phone use the rate of such cancer was found to be 0.0333% for those not using cell phones. Complete parts (a) and (b) a. use the sample data ...
*Tuesday, April 30, 2013 at 1:04am*

**Statistics**

Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: five percentage points; confidence level 90% from a prior study, ^p is estimated by the decimal equivalent 56% n= (Round up to the nearest integer)
*Tuesday, April 30, 2013 at 12:44am*

**Statistics**

Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: 0.06; confidence level 90% ^p and ^q unknown n= (round up to the nearest integer)
*Tuesday, April 30, 2013 at 12:38am*

**Statistics**

Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p. n=500, x=350, 90% confidence ?<p<? (Round to three decimal places as needed.)
*Tuesday, April 30, 2013 at 12:35am*

**Statistics **

Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 95% confidence the sample size is 2096 of which 25%are successes The margin of E= (round to four decimal places ...
*Tuesday, April 30, 2013 at 12:29am*

**statistics**

a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers
*Monday, April 29, 2013 at 7:15pm*

**Statistics**

the scoring of IQ tests is designed so that the scores of the test taking population are normally distributed with a mean of 100 and a standard dev of 15. what percent of the population have an IQ less than 92? how do i figure this out?
*Monday, April 29, 2013 at 11:21am*

**statistics**

Let X represent the outcome of a single roll of a fair die. Suppose you will win $2 if the outcome is either 2 or 5, and lose $1 otherwise. What are your expected winnings in 20 tosses?
*Monday, April 29, 2013 at 10:12am*

**statistics**

the probability that a house in an urban area will develop a leak is 5%. if 23 houses are randomly selected, what is the probability that none of the houses will develop a leak?
*Sunday, April 28, 2013 at 4:18pm*

**Statistics**

Suppose x has a mound-shaped distribution with sigma = 9 . A random sample of size 36 has sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m? Explain. Find a 95% confidence interval for m. Explain the ...
*Saturday, April 27, 2013 at 6:54pm*

**Life orientation**

Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.
*Saturday, April 27, 2013 at 2:07pm*

**Life orientation**

Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.
*Saturday, April 27, 2013 at 2:02pm*

**statistics**

A random sample of 100 of a population Mean is 31 and standard deviation 22 Approximate probability of 28
*Saturday, April 27, 2013 at 10:45am*

**statistics**

A convenience store owner believes that the median number of lottery tickets sold per day is 49. A random sample of 20 days yields the data below. Find the critical value to test the owner's claim. 32 48 59 64 31 55 70 27 33 38 47 54 54 44 44 49 49 59 54 38
*Friday, April 26, 2013 at 11:48pm*

**more statistics**

The percent of fat calories that a person in America consumes each day is normally distributed with a mean of 36 and a standard deviation of about 10. Suppose that 16 individuals are randomly chosen for an experiment. Completely describe the distribution of sample means for ...
*Friday, April 26, 2013 at 9:37pm*

**computer science**

What does it mean when there is a high prior probability in terms of Baynesian statistics?
*Friday, April 26, 2013 at 4:55pm*

**statistics**

An independent-measures research study computes three treatment conditions with a sample of n=10 in each conditions. The sample means are M1=2, m2=3, and m3=7. a. Compute SS for the set of 3 treatment means. (Use the three means as a set of n=3) scores and compute SS.)
*Friday, April 26, 2013 at 3:42pm*

**AP Statistics**

A school psychologist reports that the mean number of hours the students at this school sleep each night is 8 hours. The students believe the mean is not 8 hours. To find an estimate of the true mean, they select a random sample of 15 students from their school and ask how ...
*Friday, April 26, 2013 at 3:25pm*

**statistics**

A company produces batteries whose lifetimes are normally distributed with a mean of 100 hours. It is known that 90% of the batteries last at least 40 hours. (i). Estimate the standard deviation lifetime. (3 marks) (ii). What percentage of batteries will not last 70 hours?
*Friday, April 26, 2013 at 12:51pm*

**Psychology Statistics**

2 For a sample of n = 20 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with = .05? 3 The Pearson correlation is calculated for a sample of n = 25 individuals. What value of df should be used to ...
*Friday, April 26, 2013 at 8:19am*

**statistics**

The manager of a local gym has determined that the length of time members spend at the gym is a normally distributed variable with a mean of 80 minutes and a standard deviation of 20 minutes. What proportion of members spend less than 55 minutes at the gym? Use the standard ...
*Friday, April 26, 2013 at 5:30am*

**statistics**

out of ten questions two students got 8 wrong find out probability if they are cheating
*Thursday, April 25, 2013 at 9:46pm*

**Statistics**

A school is running a raffle. There are 100 tickets, of which 3 are winners. You can assume that tickets are sold by drawing at random without replacement from the available tickets. Teacher X buys 10 raffle tickets, and so does Teacher Y. Find the chance that one of those two...
*Thursday, April 25, 2013 at 5:05pm*

**Statistics**

To test H0: = 80 versus H1: < 80. a simple random sample of size n = 22 is obtained from a population that is known to be normally distributed. a) If ¯x = 76.9 and s = 8.5, compute the test statistic.
*Thursday, April 25, 2013 at 3:30pm*

**statistics**

All deal with a random variable X that follows a normal probability distribution with mean equal to 37 and a standard deviation of 5. Compute P(X < 39) Compute P(X < 29 or X > 41) Compute P(X > 30) Find the 42nd percentile for this distribution.
*Thursday, April 25, 2013 at 3:28pm*

**statistics**

All deal with a random variable X that follows a normal probability distribution with mean equal to 37 and a standard deviation of 5. Compute P(X < 39) Compute P(X < 29 or X > 41) Compute P(X > 30) Find the 42nd percentile for this distribution.
*Thursday, April 25, 2013 at 3:27pm*

**Statistics**

Find the binominal probability...n = 15, p = .04, find P(fewer than 3)
*Thursday, April 25, 2013 at 2:15pm*

**statistics**

The duration of time it takes General Motors to build a car is normally distributed with a mean of 31 hours and a standard deviation of 2 hours. a) What is the probability that a single car, selected at random, will take between 28 and 34 hours? b) What is the probability that...
*Thursday, April 25, 2013 at 1:42pm*

**statistics**

0.57 of all college students like the idea of a new curriculum. If we select 88 students (ASSUME INDEPENDENCE), what is the Standard Deviation of (the Probability Distribution that would list the number of students (from 0 to 88) and the probability of each.) THE STANDARD ...
*Wednesday, April 24, 2013 at 8:37pm*

**statistics**

A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours. (a) Develop a 95 percent confidence interval for the population mean number of ...
*Wednesday, April 24, 2013 at 8:02pm*

**statistics **

adult males have normally distributed heights with mean of 69.0 in and a standard deviation of 2.8 in. if a clothing manufacture decides to produce goods that exclude the shortest 12% and the tallest 12% of adult males, find the minimum and maximum heights that they will fit.
*Wednesday, April 24, 2013 at 6:22pm*

**statistics**

if no preliminary sample is taken to estimate p, how large a sample is necessary to be 87% sure that the point estimate will be within a distance of 0.04 from p?
*Wednesday, April 24, 2013 at 6:05pm*

**statistics**

Your mail-order company advertises that it ships 95% of its orders within three working days. You select an SRS of 100 of the 5000 orders received in the past week for an audit. The audit reveals that only 91 of these orders were shipped on time. A) What is the sample ...
*Wednesday, April 24, 2013 at 4:31pm*

**statistics**

A study of 36 marathon runners showed that they could run at an average rate of 7.8 miles per hour. The sample standard deviation is 0.6. Find a point estimate of the population mean. Find the 90% confidence interval forthe mean of all runners. Based on the results, what ...
*Wednesday, April 24, 2013 at 12:58pm*

**statistics**

Suppose that the test scores for a college entrance exam are normally distributed with a mean of 450 and a standard deviation of 100. If a student is selected at random what is the probability that the student will score above 600?
*Wednesday, April 24, 2013 at 11:36am*

**statistikc **

We want a confidence interval for the mean IQ of all the 7th grade girls in that school district. We do not know the population standard deviation so we use the confidence interval that uses the t. In order to use the t-interval we need to assume that the variable IQ has a ...
*Wednesday, April 24, 2013 at 11:15am*

**Statistics**

The yearly returns of a stock are normally distributed with a mean of 5.1% and standard deviation of 2.7%. Find the probability of a yearly return being greater than 6%.
*Wednesday, April 24, 2013 at 6:38am*

**Statistics**

What is the lowest z-value for the highest 2% of observations on the standard normal distribution?
*Wednesday, April 24, 2013 at 6:33am*

**Statistics**

What is the highest z-value for the lowest 10% of observations on the standard normal distribution?
*Wednesday, April 24, 2013 at 6:32am*

**LIFE ORIENTATION**

IDENTIFY & DESCRIBE 3 ENVIRONMENTAL HEALTH HAZARDS THAT CAUSE ILL HEALTH, CRISISES & DISASTERS WITHIN A COMMUNITY IN SOUTH AFRICA & GLOBALLY. INCLUDE EVIDENCE THAT IS CURRENT OF THE IDENTIFIED ISSUES. USE GRAPHS, STATISTICS & PICTURES TO SHOW EVIDENCE OF YOUR INFORMATION.
*Wednesday, April 24, 2013 at 1:31am*

**statistics**

The daily sales of a retail store are normally distributed with a standard deviation of $500. If the probability that sales will be less than $10,000 in any one day is 40%, what are the mean daily sales?
*Tuesday, April 23, 2013 at 10:46pm*

**statistics**

What is the probability that 10 of 100 apples will be < 130 g? mean=173 std deviation=34?
*Tuesday, April 23, 2013 at 9:55pm*

**Statistics**

The Toylot company makes an electric train with a motor that it claims will draw an average of only 0.8 ampere (A) under a normal load. A sample of twelve motors was tested, and it was found that the mean current was x = 1.26 A, with a sample standard deviation of s = 0.40 A. ...
*Tuesday, April 23, 2013 at 9:52pm*

**Statistics**

Based on information from Harper's Index, 37 out of a random sample of 100 adult Americans who did not attend college believe in extraterrestrials. However, out of a random sample of 100 Americans who did attend college, 41 claim that they believe in extraterrestrials. At ...
*Tuesday, April 23, 2013 at 5:23pm*

**Psychology**

An essential part of scientific thinking is not only how to use statistics correctly, but also how to identify the misuse of statistics. Our textbook authors suggest that students should: Answer distrust all statistics because they convey a false impression of certainty and ...
*Tuesday, April 23, 2013 at 4:11pm*

**statistics**

2. Why is it important to know the mean and standard deviation for a data set when applying the empirical rule? 3. If we are focused on 68% of the normal distribution, what percentage of the distribution is left in the upper tail only? 4. What value separates the 50% of the ...
*Tuesday, April 23, 2013 at 3:43pm*

**Statistics**

A sport preference poll yielded the following data for men and women. Use a 5% significance level and test to determine if sport preference and gender are independent. Sport Preferences of Men and Women Basketball Football Soccer Men 20 25 30 75 Women 18 12 15 45 38 37 45 120 ...
*Tuesday, April 23, 2013 at 11:25am*

**Statistics**

The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 11.2 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by ...
*Tuesday, April 23, 2013 at 11:24am*

**statistics**

1. In a Gallup poll of 1,038 adults, 540 said that second-hand smoke is very harmful. What is the percentage of adults who said second-hand smoke is very harmful?
*Monday, April 22, 2013 at 7:50am*

**statistics**

When you add the values 3, 5, 8, 12, and 20 and then divide by the number of values, the result is 9.6. Which term best describes this value: average, mean, median, mode, or standard deviation?
*Monday, April 22, 2013 at 7:45am*

**statistics**

from a normally distributed infinite number of iron bars lengths with a mean and standard deviation as 4 ft. and 0.6 ft. respectively, a sample of 100 bars is taken. if the sample mean is 4.2 ft., can the sample be called a truely random sample?
*Monday, April 22, 2013 at 3:39am*

**Statistics**

International Pictures is trying to decide how to distribute its new movie ‘Claws’. ‘Claws’ is the story of an animal husbandry experiment at the University of Southern Queensland that goes astray, with tragic results. An effort to breed meatier chickens ...
*Monday, April 22, 2013 at 2:35am*

**Statistics**

An insurance company wishes to examine the relationship between income (in $,000) and the amount of life insurance (in $,000) held by families. The company drew a simple random sample of families and obtained the following results: (Family) (Income) (Amount of life insurance) ...
*Monday, April 22, 2013 at 2:29am*

**Statistics**

A production process produces an item. In a recent study, the company found that 20% of all items produced were defective. Each item is inspected before being shipped. 10% of the items were misclassified( labeled as defective when they were good or labeled good when they were ...
*Sunday, April 21, 2013 at 7:19pm*

**statistics**

To get an A grade on the test, you need a total score of more than 16 points. One of the students knows the correct answer to 6 of the 20 questions. The rest she guesses at random by tossing a coin (one toss per question, as in 4B). What is the chance that she gets an A grade ...
*Sunday, April 21, 2013 at 2:35pm*

**Statistics**

The amount of rainfall in January in a certain city is normally distributed with a mean of 4.2 inches and a standard deviation of 0.5 inches. Find the value of the quartile Q1
*Sunday, April 21, 2013 at 1:39pm*

**Math (Statistics)**

Two Cards are drawn without replacement from a deck of 52 cards. What are the odds in favor of drawing two honour cards (A,K,Q,J,10)?
*Sunday, April 21, 2013 at 11:47am*

**Psychological Statistics**

A researcher asks participants to sample tap water and bottled water. out of 40 people, 28 selected bottled water. was the bottled water selected significantly more often? Use two tailed test with a+.05
*Saturday, April 20, 2013 at 3:46pm*

**statistics**

r=-.96 between cravings for pizza and ability to concentrate on studying
*Saturday, April 20, 2013 at 2:03pm*

**statistics**

some 24% of the men compared to 62% of the women responded yes suppose that 150 women and 200 men were interviewed construct a 95% confidence interval
*Saturday, April 20, 2013 at 12:10pm*

**life orientation**

Identify and describe 3 environmental health that cause ill health, crises and or disaster within your community or any any other community within south africa and globally. Include evidence that is current of the identified issues. Use graphs, statistics pictures etc to show ...
*Saturday, April 20, 2013 at 10:40am*

**Statistics**

A die has one red face, two blue faces, and three green faces. It is rolled 5 times. Find the chance that the red face appears on one of the rolls and the remaining rolls are green. [Careful what you multiply. The most straightforward method is to follow the derivation of the ...
*Saturday, April 20, 2013 at 10:29am*

**statistics**

A study found that citizens spend on average $1950 per year on groceries with a standard deviation of $100. Assume that the variable is normally distributed. 5. Identify the population mean. 6. Identify the population standard deviation. 7. Find the probability that a sample ...
*Friday, April 19, 2013 at 4:11pm*

**STATISTICS**

the percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9
*Friday, April 19, 2013 at 3:30pm*

**STATISTICS**

A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.
*Friday, April 19, 2013 at 3:28pm*

**statistics**

The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?
*Friday, April 19, 2013 at 2:36pm*

**Statistics**

how can I decide to reject or fail to reject the following null hypothesis? let a= 0.05,data; p=0.69, n=32, test statistic z= 0.09095 H(0);p=0.68 H(1)p>0.68
*Friday, April 19, 2013 at 12:21pm*

**Statistics**

how can I determine weather to reject or fail to reject the following nul hypothosis: let a= o.01, data: s= 3.1, n=55 and H(0) st dev 2.8 and H(1)< 2.8
*Friday, April 19, 2013 at 12:15pm*

**Business Statistics 2**

A consumer research group is interested in testing an automobile manufacturer’s claim that a new economy model will travel at least 25 miles per gallon of gasoline (H0: μ 25). a. With a .02 level of significance and a sample of 30 cars, what is the rejection ...
*Thursday, April 18, 2013 at 4:48pm*

**Statistics**

The design tolerance thickness for an automotive part is 55mm to 65mm. If the process mean thickness is 61mm with a standard deviation of 2.3mm, then what percentage of the sheets will be acceptable?(What percentage will fall within the design tolerence?) Assume that the ...
*Thursday, April 18, 2013 at 2:53pm*

**statistics**

A person is selected at random from a population that has the following characteristics: 65% of the people are men; the others are women 12% of the men are smokers 7% of the women are smokers 1. Find the chance that the selected person is a non-smoker, given that the person is...
*Thursday, April 18, 2013 at 11:40am*

**statistics**

An oil change shop advertised to change oil within 15 minutes. Based on the data collected on a typical day, what is the probability that oil change will take 15 minutes or less time? Based on the data, do you think the business claim is valid? Explain why or why not.
*Thursday, April 18, 2013 at 9:10am*

**life orientation**

identify and describe 3 environmental health hazards that cause ill health, crisises and or disaster within your community or any other community within south africa and globally. include evidence that is current of the identified issues. use graphs, statistics, pictures and ...
*Thursday, April 18, 2013 at 8:53am*

**Statistics**

A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion. a) State the 95% confidence interval for ...
*Wednesday, April 17, 2013 at 11:20pm*

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