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December 22, 2014

December 22, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics**

Assume that X, the starting salary offer to psychology majors is normally distributed with a mean of $47,507 and a SD of $5000. 1. The probability that a randomly selected psychology major received a starting salary offer greater than $52,000 is______. 2. The probability a ...
*Thursday, October 23, 2014 at 12:59am*

**statistics**

An instructor in a large lecture class found at the end of the semester that total points scored by students in his class was approximately Normal with mean 530 and standard deviation 80. If 10% of the class are to receive A's (he grades on a curve), what is the lowest ...
*Thursday, October 23, 2014 at 12:30am*

**Business Statistics**

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal, October 12, 2012). A ...
*Wednesday, October 22, 2014 at 1:27pm*

**statistics**

n employee produces 2,080 hours of work in the course of a year, how many employees will be required for the coding area if the coding time on average for one record is 30 minutes and there are 12, 500 records that must be coded each year?
*Wednesday, October 22, 2014 at 3:55am*

**statistics**

A researcher is interested in determining whether acupuncture affects pain tolerance. An experiment is performed in which 15 students are randomly chosen from a large pool of university undergraduate volunteers. Each subject serves in two conditions. In both conditions, each ...
*Tuesday, October 21, 2014 at 6:22pm*

**statistics**

The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...
*Tuesday, October 21, 2014 at 4:20pm*

**Statistics**

Graduation rate for students in a program is 80%. If 10 students from it are selected at random, find the probability that AT LEAST 8 of them graduated.
*Tuesday, October 21, 2014 at 3:17am*

**Statistics**

A student makes random guesses on 6 multiple-choice questions. One of the 5 choices in each question is correct. What is the probability that the student will get at most 4 answers right?
*Tuesday, October 21, 2014 at 2:54am*

**Statistics**

Astudent makes random guesses on 6 multiple-choice questions. One of the 5 choices in each question is correct. What is the probability that the student will get at most 4 answers right?
*Tuesday, October 21, 2014 at 2:51am*

**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: x1 = 648, s12 = 120, ...
*Tuesday, October 21, 2014 at 12:40am*

**Statistics**

Data Set A: Average = $157 Standard Dev. = $84 Data Set B: Average = 34 oz. Standard Dev. = 21 oz Which Data Set is more variable?
*Monday, October 20, 2014 at 10:56pm*

**English-Annotation Please Help **

In the recent years, the media has shared with the public two very different stories involving children who committed acts of violence. Both minors were charged with murder and sent to adult state prison to serve their prison sentences. Some people may believe these teens ...
*Monday, October 20, 2014 at 10:13pm*

**statistics**

The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...
*Monday, October 20, 2014 at 7:49pm*

**statistics**

Use the z-table to find the requested probabilities. Enter your answers to 4 decimal places. (a) P(z < −1.02) = Incorrect: Your answer is incorrect. (b) P(z ≥ 2.43) = (c) P(−1.80 < z < 1.36) =
*Monday, October 20, 2014 at 5:17pm*

**statistics**

Assume heights and weights are normally distributed with the given means and standard deviations from the table below. Strata Mean Standard Deviation Mean Standard Deviation Height Height Weight Weight (inches) (inches) (pounds) (pounds) U.S. Men 69.3 2.8 191 28 U.S. Women 64....
*Monday, October 20, 2014 at 5:08pm*

**statistics**

The bass in Clear Lake have weights that are normally distributed with a mean of 1.9 pounds and a standard deviation of 0.8 pounds. (a) If you catch 3 random bass from Clear Lake, find the probability that the mean weight is less than 1.0 pound. Round your answer to 4 decimal ...
*Monday, October 20, 2014 at 5:01pm*

**statistics**

Potatoes - Samples: Assume the weights of Farmer Carl's potatoes are normally distributed with a mean of 8.0 ounces and a standard deviation of 1.3 ounces. He bags his potatoes in groups of 6. You buy a bag and the total weight is 42 ounces. Here we determine how lucky or ...
*Monday, October 20, 2014 at 4:57pm*

**Statistics**

Find the probability of winning the lottery Select the six winning numbers from 1 to 34. (in any order, no repeats) P(winning)= ?
*Monday, October 20, 2014 at 4:07pm*

**statistics**

The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...
*Monday, October 20, 2014 at 5:41am*

**statistics**

Workers in several industries were surveyed to determine the proportion of workers who feel their industry is understaffed. In the government sector, 37% of the respondents said they were understaffed, in the health care sector 33% said they were understaffed, and in the ...
*Monday, October 20, 2014 at 1:22am*

**Statistics**

Suppose a certain species bird has an average weight of grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with grams. For a small group of 13 birds, find the margin of error for a 70% confidence interval for the average ...
*Sunday, October 19, 2014 at 9:32pm*

**statistics**

a researcher wants to find a model that relates square footage
*Sunday, October 19, 2014 at 7:32pm*

**statistics**

For two events, C and D, P(C)=.16 and P(D)=.18 If C and D are independent events, then find P(D intersect C) and P(C given D) and P(D U C)
*Sunday, October 19, 2014 at 6:58pm*

**Statistics**

Waiting times to receive food after placing an order at the sandwich shop follow an exponential distribution with a mean of 46 seconds.? Calculate the probability a customer waits: a.) Less than 26 seconds b.) More than 105 seconds c.) Between 38 and 60 seconds d.) Fifty ...
*Sunday, October 19, 2014 at 4:01pm*

**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...
*Sunday, October 19, 2014 at 1:40pm*

**statistics**

what is the percentage of the area under the curve is above the mean of the normal curve
*Sunday, October 19, 2014 at 9:13am*

**Statistics**

Mark and job are basketball players and will play a game. In the game, Mark will get 2 free throw attempts and John will get three. Overall, Mark makes a basket on 90% of free throw attempts and John makes it 50% of the time. Mark will win the game if he makes more free throws...
*Sunday, October 19, 2014 at 9:03am*

**English**

I need help annotating please help me In the recent years, the media has shared with the public two very different stories involving children who committed acts of violence. Both minors were charged with murder and sent to adult state prison to serve their prison sentences. ...
*Saturday, October 18, 2014 at 4:44pm*

**STATISTICS**

THE DISTRIBUTION OF THE NUMBER OF VIEWERS FOR THE AMERICAN IDOL TELEVISION SHOW FOLLOWS A NORMAL DISTRIBUTION WITH A MEAN OF 29 MILLION AND A STANDARD DEVIATION OF 5 MILLION. WHAT IS YHE PROBABILITY NEXT WEEKS SHOW WILL: HAVE AT LEAST 23 MILLION
*Saturday, October 18, 2014 at 2:42pm*

**Criminal Justice/Report Writing**

Which of the following is one of the reasons the Uniform Crime Reporting Program __________ in 1982? A. was renamed the Summary Data Reporting System B. discontinued collecting and tracking statistics C. was revised D. broke ties with the FBI I am torn between A & C.
*Saturday, October 18, 2014 at 12:13pm*

**English**

1. Why would an author use other words like adolescent, teen, or young people just to describe minor? 2. How do you correctly punctuate sentences containing documented evidence? 3. From this thesis statement , what topic can you form out of it: Some people may believe these ...
*Friday, October 17, 2014 at 8:44pm*

**statistics**

A college student takes a standardized test and scores a 163. If the mean is 155 and the standard deviation is 7, what is the student’s percentile rank? (Assume a normal distribution.)
*Friday, October 17, 2014 at 2:25pm*

**statistics**

Scores on a national writing exam are approximately normally distributed, with a mean of 490 and a standard deviation of 20. Consider random samples of size 25 from the population of test takers. describe the sampling distribution of a sample mean. shape mean= standard ...
*Friday, October 17, 2014 at 5:11am*

**Statistics**

The manufacturer of Sleepeze has asked you to test the effectiveness of the drug. You decide to test the effectiveness using the drug and a placebo. You select a select a group of 500 subjects and randomly assign them to either the treatment group or the placebo group. Is this...
*Thursday, October 16, 2014 at 12:05pm*

**Statistics**

A supermarket chain wants to verify that the bottler of their store brand of soda is in fact filling the cans to the specified volume. They took several “cubes” from the shelves and measured the amount in each can. Is this an observational study or a designed ...
*Thursday, October 16, 2014 at 10:53am*

**statistics**

in new york city the average response time for calls to the first depatrment is a bout 5 minutes with a standarrd deviation of 1.5 minuties suppose response follow a normal distribuation. 1-what is the probability that a response time exceeds 9 minutes/ 2-compute the top 10 th...
*Thursday, October 16, 2014 at 4:27am*

**Statistics**

The late English psychologist Cyril Burt was known for his studies of the IQ scores of identical twins who were raised apart. The high correlation between the IQs of separated twins in Burt's studies pointed to heredity as a major factor in IQ. (Correlation measures how ...
*Thursday, October 16, 2014 at 1:49am*

**statistics**

show me Police academy acceptance exams to qualify for a police academy, applicants are given a test of physical fitness. the scores are norally distributed with a mean of 64 and standard deviation of 9. if only the top 20% of the applicants are selected find the cutoff score?
*Wednesday, October 15, 2014 at 11:34pm*

**Statistics **

True or false: as then number in the sample becomes larger and larger (assuming it means as the sample gets larger and larger), then the mean of the sampling distribution is equal to the population distribution for any normal population. Is it false? That it would be ...
*Wednesday, October 15, 2014 at 9:37pm*

**Statistics**

Find the area under the standard normal curve that lies between z = -2.09 and z = 1.98. Note: the graph may not be drawn to scale.
*Wednesday, October 15, 2014 at 9:24pm*

**Statistics**

The probability that a student uses the Academic Resource Center on a regular basis is 0.43 . In a group of 21 students, what is the probability that exactly 4 of them use the Academic Resource Center on a regular basis?
*Wednesday, October 15, 2014 at 9:14pm*

**Basic Statistics**

The Suva Energy Information Administration reported that 51.7% of homes in Sunnyville were heated by natural gas. A random sample of 200 homes found that 115 were heated by natural gas. Does the evidence supports the claim, or has the percentage changed? (Use a P-value method).
*Wednesday, October 15, 2014 at 8:07pm*

**Statistics**

A rental agency claims that the average rent that small-business establishments pay in Suvacity is $800. A sample of 10 establishments shows an average rate of $863. The standard deviation of the sample is $20. At α = 0.05,is there enough evidence to reject the agencies ...
*Wednesday, October 15, 2014 at 7:39pm*

**Basic Statistics**

A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050,how large a sample is needed to get the desired information and to be accurate within...
*Wednesday, October 15, 2014 at 8:47am*

**Basic Statistics**

A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per litre with a standard deviation of 2.3 kilometers per litre. (a)Assuming that the kilometers per litre given by all mid-sized cars have a normal distribution,find a 99% ...
*Wednesday, October 15, 2014 at 8:37am*

**Statistics**

The points of 100 children in a test are normally distributed with mean of 25 points and a standard deviation of 10 points. (a)Given that the passing mark is 20, estimate the number of children who passed the test. (b)If 5.59% of the children obtain a distinction by scoring x ...
*Wednesday, October 15, 2014 at 8:27am*

**Statistics**

A university sends a monthly newsletter on health to its employees. One issue included a column called "What Is the Chance?" that said: Chance that you'll die in a car accident this year: 1 in 75. There are about 310 million people in the US. About 40000 people ...
*Wednesday, October 15, 2014 at 4:29am*

**Statistics**

A university sends a monthly newsletter on health to its employees. One issue included a column called "What Is the Chance?" that said: Chance that you'll die in a car accident this year: 1 in 75. There are about 310 million people in the US. About 40000 people ...
*Wednesday, October 15, 2014 at 4:29am*

**Pre-Cal**

The prerequisite for Statistics is precalculus. College of Nursing students (only) are eligible to have the prereq waived. What does waived means?
*Tuesday, October 14, 2014 at 5:38pm*

**statistics**

How could you reword the research hypotheses below to null hypotheses?a. Smoking during pregnancy increases the risk of a child being born prematurely.
*Tuesday, October 14, 2014 at 1:35pm*

**statistics**

A population has a mean of 300 and a standard deviation of 50. Suppose a sample of size 125 is selected and is used to estimate . What is the probability that the sample mean will be within +/- 3 of the population mean (to 4 decimals)?
*Tuesday, October 14, 2014 at 12:40pm*

**Statistics**

4 people are chosen at random from a group of 15 people. What are the odds that all 4 people chosen were the oldest people in the group?
*Monday, October 13, 2014 at 9:37pm*

**statistics**

Employees at Evergreen Manufacturing company have annual salaries ranging from a low $12,500 to a high of 92,000. Assuming that you want to construct a frequency table with eight classes, find the upper and lower limits of the first class. How do I work the problem? Please?
*Monday, October 13, 2014 at 8:44pm*

**Statistics and Probability**

Winning the jackpot in a lottery requires that you select the correct three numbers between 1 and 51 and in a another separate drawing you must select the correct single number between 1 and 15. Find the probability of winning the jackpot- The probability of winning the ...
*Monday, October 13, 2014 at 3:40pm*

**Statistics**

Find the probability of winning a lottery with the following rule. Select the five winning numbers from 1,2...,23. (in any oder. No repeats) P(winning)= ?
*Monday, October 13, 2014 at 2:38am*

**Math Statistics**

Answer the following. Show your work to get credit. Exam scores are normally distributed with a mean of 81 and a standard deviation of 9. a) What is the minimum score one must have to be in the top 4% of the students taking the exam? b) What percentage of scores are below 90? ...
*Monday, October 13, 2014 at 1:31am*

**statistics**

Answer the following. Show your work to get credit. Exam scores are normally distributed with a mean of 81 and a standard deviation of 9. a) What is the minimum score one must have to be in the top 4% of the students taking the exam? b) What percentage of scores are below 90? ...
*Monday, October 13, 2014 at 12:36am*

**Statistics**

A researcher measures the following scores for a group of people. The X variable is the number of errors on a math test, and the Y variable is the person’s level of satisfaction with his/her performance. (a) With such ratio scores, what should the researcher conclude ...
*Monday, October 13, 2014 at 12:19am*

**Statistics**

Using a scatter diagram with x(age in weeks) of calves and y (weight in kg) and the info is as follows Week 1 /42kgs Week 3 /50 kgs Week 10/75 kgs Week 16/100kgs Week 26/150kgs week 36/200kgs would you estimate the linear correlation coefficient R to be positive , close to ...
*Sunday, October 12, 2014 at 10:16pm*

**statistics**

A box contains 19 red marbles and 19 green marbles. Sampling at random from the box five times with replacement, you have drawn a red marble all five times. What is the probability of drawing a red marble the sixth time?
*Sunday, October 12, 2014 at 10:13pm*

**statistics**

The Office of Student Services at a large western state university maintains information on the study habits of its full-time students. Their studies indicate that the mean amount of time undergraduate students study per week is 20 hours. The hours studied follows the normal ...
*Sunday, October 12, 2014 at 10:05pm*

**statistics**

11. All probabilities can be expressed as decimal values ranging from 0 to 1.00.
*Sunday, October 12, 2014 at 9:01pm*

**Statistics**

As part of studying the relationship between mental and physical health, you obtain the following heart rates: 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 In terms of differences in heart rates, interpret these data using the following: (a) the range, (b) the variance...
*Sunday, October 12, 2014 at 6:55pm*

**statistics**

For the data in question 13, find the raw scores that correspond to the following: (a) z 5 11.22; (b) z 5 20.48.
*Sunday, October 12, 2014 at 5:25am*

**statistics**

the average number of passengers on a subway car is 60. If the number of passengers on a car has normal distribution with a standard deviation of 20, approximately what the percent of subway cars carry more than 80 passengers?
*Sunday, October 12, 2014 at 1:23am*

**statistics**

A computer is used to randomly select a number between 1 and 2000. Event A is selecting 460.
*Saturday, October 11, 2014 at 9:19pm*

**statistics**

A population has m = 50. What value of s would make X = 55 a central, representative score in the population?
*Saturday, October 11, 2014 at 6:02pm*

**statistics**

On this semesters final exam, john scored 72 on his calculus exam and 53 on his statistics exam. The z score for both exams was the same. Which on would he do better on? a. calculus b.statistics c. the exam scores are equivalent
*Saturday, October 11, 2014 at 5:52pm*

**statistics**

suppose that the teacher of this class graded solely on a curve - 10% get A, etc. How might this effect students getting into into study groups to prepare homework or tests?
*Saturday, October 11, 2014 at 2:51pm*

**statistics**

a) What is the standard deviation of the set of data? b) What raw score will have 15% of the data set above it? c) If I have a raw score of 21 what percentage of the scores, are below my score? 16, 16, 89, 76, 24, 45, 98, 20, 22, 28, 34, 35, 76, 67, 48, 37
*Saturday, October 11, 2014 at 12:28pm*

**statistics**

Using the z table what z score would cut off the upper 25% of scores.
*Saturday, October 11, 2014 at 12:07am*

**statistics**

which of the following percentiles corresponds to the area beneath the normal curve from a z score of -1.00 to +1.00 a.98% b.34% c.68% d.100%
*Friday, October 10, 2014 at 9:31pm*

**statistics**

On this semesters final exam, john scored 72 on his calculus exam and 53 on his statistics exam. The z score for both exams was the same. Which on would he do better on? a. calculus b.statistics c. the exam scores are equivalent
*Friday, October 10, 2014 at 8:17pm*

**statistics**

If a distribution of test scores has μ = 65 with σ = 6, and you scored at the 89th percentile, what is your score?
*Friday, October 10, 2014 at 5:36pm*

**statistics**

I need to find the chi square distribution. Thanks During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a ...
*Friday, October 10, 2014 at 3:06pm*

**Statistics**

the assets (in billions of dollars) of the four wealthiest people in a particular country are 39, 32, 11, 10. assume that samples of size n = 2 are randomly selected with replacement from this population of four values
*Friday, October 10, 2014 at 9:33am*

**statistics**

A congressional committie has of 8 senators and 7 representatives. How many ways can a subcomittie of 6 be formed from the full committee if exactly 5 of the members must be senators?
*Friday, October 10, 2014 at 7:48am*

**Statistics**

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,325 per hour and a standard deviation of $240. What is the operating cost for the lowest 5 percent of the airplanes?
*Thursday, October 9, 2014 at 11:31pm*

**statistics**

I need to find the chi square distribution. Thanks During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a ...
*Thursday, October 9, 2014 at 10:09pm*

**statistics**

During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
*Thursday, October 9, 2014 at 9:07pm*

**statistics **

During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
*Thursday, October 9, 2014 at 4:49pm*

**statistics**

if you lose 10% a year, how much will be left of 2.44 million in 26 years?
*Thursday, October 9, 2014 at 2:53pm*

**Statistics **

During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
*Thursday, October 9, 2014 at 1:57pm*

**statistics; emergency please help me**

During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following...
*Wednesday, October 8, 2014 at 9:58pm*

**Sociology (Statistics) Confidence Level**

Help me solve this please. One of the few on my list that I had no idea how to solve. A medical researcher is interested in the prenatal care received by pregnant women in inner cities. She interviews 35 randomly selected women with children on the streets of Baltimore and ...
*Wednesday, October 8, 2014 at 9:17pm*

**statistics**

Please read and use the following information to answer questions 11, 12, and 13: Big packages of M&M Plain Candies have a mean weight of 16 ounces with a standard deviation of .15 ounces. A chocolate loving researcher decides to a random sample of 20 big bags of M&M Plain ...
*Wednesday, October 8, 2014 at 8:28pm*

**statistics**

Correction On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \?=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, ?=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/2.04=1.960
*Wednesday, October 8, 2014 at 8:11pm*

**statistics**

On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \?=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, ?=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120
*Wednesday, October 8, 2014 at 8:03pm*

**Math & Statistics**

Problem 6 [Total 5 marks] The drug Ziac is used to treat hypertension. In a large clinical trial it was found that 32% of those in the placebo group experienced dizziness. (a) [1 mark] Assuming that the same 32% proportion applies to subjects taking the drug, find the ...
*Wednesday, October 8, 2014 at 5:37pm*

**statistics**

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 42 and a standard deviation of 10. Using the empirical rule (as ...
*Wednesday, October 8, 2014 at 4:52pm*

**Statistics-Help please??**

Given a mean of 25 and a standard deviation of 2.3, what is the z-score of a data value of 29? I don't understand the formula they gave me for the z-score, so I dunno where to start. /:
*Wednesday, October 8, 2014 at 3:51pm*

**statistics**

Norma finds her mean number of minutes per call to be 27, with a standard deviation of 6 minutes. The minutes per call are approximately normally distributed around 27 with no outliers.
*Wednesday, October 8, 2014 at 3:09pm*

**Pyschological Statistics**

In a distribution with a standard deviation of eight, an individual score of 42 corresponds to a Z score of -0.5. What is the mean of this distribution?
*Wednesday, October 8, 2014 at 10:48am*

**Statistics**

You own shares of Fidelity Magellan Fund (FMF), which concentrates on stocks of large American companies. Its monthly return is μFMF = 1.4% and sFMF = 4.70%. You decided to diversify your portfolio by adding shares of the Fidelity Japan Fund (FJF), which has monthly ...
*Wednesday, October 8, 2014 at 2:19am*

**Statistics**

In a sophisticated medicine research center, two scales are used for repeated weighing of the same item. If the true weight of a compound is 2 grams [g], the first scale produces readings X that have a mean 2.0 g and standard deviation 0.03 g. The second scale’s readings ...
*Wednesday, October 8, 2014 at 2:18am*

**statistics**

in order to estimate the mean amount of time computer users spend on the internet ea mn, how many people do i interview to have 90% confident sample mean within 11 min of the pop mean? Assum sd= 203 min
*Wednesday, October 8, 2014 at 12:56am*

**Statistics**

On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \σ=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, σ=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120
*Tuesday, October 7, 2014 at 9:48pm*

**statistics**

Mean time 79 min Standard deviation 8 min what is the probability of doing it in 60 min or less
*Tuesday, October 7, 2014 at 8:27pm*

**statistics**

On this semester’s final exam, Susie scored 72 on her classics exam (class distribution: μ = 65, σ = 3.57) and 53 on her psychology exam (class distribution: μ = 49, σ = 2.04). For which exam should Susie expect the better grade? a. Classics b. ...
*Tuesday, October 7, 2014 at 4:29pm*

**Statistics**

A household appliance manufacturer wants to analyze the relationship between total sales and the company's three primary means of advertising (television, magazines, and radio). All values are in millions of dollars. They found the following regression equation. Sales = ...
*Tuesday, October 7, 2014 at 3:58pm*

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