A common method of checking for pollution in a river is to measure the dissolved oxygen content in the river water at different locations. A reduction of oxygen content in the water from one location to another indicates the presence of pollution somewhere between the two locations. The Environmental Protection Agency (EPA) su
To learn about the effect of a newly developed gasoline additive on gas mileage (mpg), seven cars were driven 300 miles first without additive and then 300 miles with a gas additive. Here are the mpg's. Did the new additive improve gas mileage? Also, is the test dependent or independent. Car # m
Give an example of a hypothesis test you could perform at a Surgery Center and what the hypotheses would be.
Give an example of a hypothesis test you could perform at a Surgery Center and what the hypotheses would be. State the null and alternative hypotheses in proper format. Would you see this as a one time test or one that would be repeated on a regular basis?
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were chosen at random, and
The Grand Strand Family Medical Center is specifically set up to treat minor medical emergencies for visitors to the Myrtle Beach area. There are two facilities, one in the Little River Area and the other in Murrells Inlet. The Quality Assurance Department wishes to compare the mean waiting time for patients at the two locations
7. There is a program for STD/HIV/pregnancy education/prevention called Postponing Sexual Involvement (PSI) run in Atlanta. Evaluation data collected at the end of ninth grade as a follow-up to the program compared two group of adolescents - one treatment and one control - all of whom had not had sex at the pretest (beginning o
8. News flash from Science News (June 2, 2001). Researchers reported that breast feeding children seemed to accelerate the progression of AIDS. A study done in 1993(?!) randomly assigned HIV positive volunteer women to either a breast-feeding or bottle feeding group. Of the 200 women who used commercial formula, 6 died during th
1. The Dean is hanging his head in shame. He realizes his failings in designing an adequate research design to assess the effects of the move on majors and has revised the proposal. Unfortunately, the word processor used (WordImperfect) has scrambled the text and he needs help in correcting the text. In the paragraphs below, h
At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes?
Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes? Please sho
(See attached file for full problem description) --- 1. On a college bulletin, it is stated that the weights of the male students are normally distributed with mean = 165lb and a standard deviation = 16lb. A research student decided to verify the claim of the school by taking a sample of 64 students. The average weight of the
H-subzero: Pie = .40 H-subone: Pie does not equal .40 A sample of 120 observations revealed that p = .30. At the .05 significance level, can the null hypothesis be rejected? A: State the decision rule B: Compute the value of the test statistic C: What is your decision regarding the null hypothesis?
1. A normal tomato will gain an average of 2 ounces per week during the growing season. A sample of 100 tomatoes is given a special hormone to increase their growth. The average weight gain of tomatoes in the sample was 3 ounces with a standard deviation of 1 ounce. Conduct a hypothesis test to determine if the hormone increased
2) Disney tells you that the average distance between the ears on a Mickey Mouse hat is 5 inches. In a sample of 100 Mickey Mouse hats you find that the average distance between the ears on the hats is 5.2 inches with a standard deviation of 1 inch. Conduct a hypothesis test to determine if the average distance between the ear
5) ESPN reported in sample of 1000 homes the proportion of people who watched the Texas v. Ohio State college football game this weekend was .6. ESPN also reported that in another sample of 1000 homes the proportion of people who watched the Arizona State v. Louisiana State game was .4. Conduct a hypothesis test to determine i
Briefly describe: a statistical relation, time series, cross section, least squares, See, r, R-squared, t-value, multicollinearity and serial correlation.
I have a team research project. We have completed the first part of the paper, but are stuck on where to go with the second half and need help with writing and research and statistical testing for it. I am posting both the first part assignment, and the 2nd part which we need help with. We need help with all parts of the 2nd ha
A marketing analyst was studying the readability of two advertisements, each produced by a major company, and printed in the newspaper. A random sample of 100 marketing professors was selected. Fifty were randomly assigned to read the advertisement produced by Company A, and the other fifty were to read the advertisement produce
The following hypothesis are given: Ho: p less or equal to 0 H1: p >0 A random sample of 12 observations indicated a correlation of .32 Can we conclude that the correlation in the population is greater than 0? Use the .05 significance level. Ho is rejected if t> 1.714 t= .32SQRT 32-5/SQRT 1-(.32)^=? I don't know
Twelve students randomly selected from the entering class of college had the following SAT scores in math and English population mean=500, sigma=100 STUDENT ENGLISH MATH 1 500 545 2 551 662 3 493 561 4 519
25 randomly selected tires from a tire company has the actual tread life: 40000 40100 38400 39170 36470 41360 37980 40060 38810 40370 39860 39280 41210 38660 38960 41780 39680 36240 38000 41120 39480 35160 42270 41320 39860 The company claims that this particular tire has a tread life of 40000 miles. Is this accurate or in
A random sample of twelve 100 watt light bulbs made by Lite Up Your Life Inc had the following burn times: 1810, 1835, 1720, 1860, 2085, 1605, 1920, 1930, 1915, 1995, 1975, and 1975 hours. A random sample of fifteen 100 watt bulbs made by Lights R Us had the following burn times: 2065, 1855, 2135, 2129, 1795, 2245, 2085, 2135,
The following prices for seven games were taken from MacPrice and MacBuy catalog: GAME MACPRICE MACBUY MYST 22.99 24.99 REBEL ASSAULT 14.99 12.99 SOLITAIRE 14.99 12.99 RIVEN 29.99
A new procedure was tried on a number of patients. they were later asked whether they preferred the new procedure, the old procedure, or had no preference. Based upon the results, how do people feel? Use a 6 step hypothesis test prefer new prefer old no preference
Six people have declared their intentions to run for a county commission seat in the next general election. A political poll is conducted three-quarters of the way into the campaign to determine if there are any clear preferences on the part of the voters. One thousand twenty randomly-selected voters were asked to indicate thei
--- 1. Given the following population data: 1,2,4,5,8,9,12, and the lists of all samples of size 2 and 5: Samples of n = 2 xbar Samples of n = 5 xbar 1,2 1.5 For population 1,2,4,5,8 4 1,4 2.5 s = ? 1,2,4,5,9 4.2 1,5 3 m = ? 1,2,4,5,12 4.8 1,8 4.5 1,2,4,8,9 4.8 1,9 5 1,2,4,8,12 5.4 1,12 6.5 1,2,4,
The following are the GMAT scores and the GPA's of a random sample of 6 students in a graduate school. During a 'cram' weekend the students learned several GMAT applications. With a 0.05 los did the GPAs increase? BEFORE AFTER GMAT GPA GPA 610 3.60 3.70 470 3.25 3.30 590 3.50 3.45 520 3.
Surveys have been widely used by politicians around the world as a way of monitoring the opinions of the electorate. Six months ago, a survey was undertaken to determine the degree of support for national party leader. Of a sample of 1,100, 56% indicated that they would vote for this politician. This month, another survey of 800
Studies from a local mall show the typical shopper spends 0.75 hrs shopping. The standard deviation is 0.10 hours. A sample of 45 shoppers revealed the mean time spent increased to .080 hrs. Develop a hypothesis to determine if the mean time spent is more than 0.75 hrs using the .05 significance level. Suppose the mean sh
1. An experiment is designed to test the effectiveness of a specific type of gender selection process, using 15 couples trying to have baby girls. Here is the question: The empirical rule applies to bell-shaped (normal) distributions. Is the binomial probability distribution for this experiment approximately normal? Show w
1. Suppose a sample of size 25 is selected from an underlying normal population, the population standard deviation is known to be 8, and the sample mean is 57. Carry out a hypothesis test at the 0.05 level of significance, where the null hypothesis H0 is  = 60 and the alternative hypothesis H1 is   60.