Hypothesis Test for Effects of Marijuana Use on College Student: In a study of the effects of marijuana use , light and heavy users of marijuana in college were tested for memory recall with the results given below. Use a 0.05 significance level to test the claim that the population of heavy marijuana users has a standard deviat
The manufacturer of Winston Tire Company claims its new tires last for an average 40,000 miles. An independent testing agency road-tested 20 tires to substantiate the claim made by the Winston Tire Company. The sample mean was 39,000 miles with a sample standard deviation of 5,000 miles. Using the .05 level of significance and
Question One. Data from the National Youth Survey on the number of assaults on students appears to indicate some gender differences. State the null and alternate hypotheses to test this theory, choose the appropriate test statistic and variance estimator and justify their choice, determine the critical value for the test statist
The following hypotheses are given. hypotheses=.40 null hypoteses not = to .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.
The following sample data were obtained from three populations that did not follow a normal distribution. Sample 1 Sample 2 Sample 3 50 48 39 54 49
For many years TV executives used the guideline that 30 percent of the audience were watching each o the prime-time networks and 10 percent were watching cable stations on a weekday night. A random sample of 500 viewers in the Oakland,California area last Monday night showed that 165 homes were tuned into the ABC affiliate, 140
In hypothesis testing, how are verbal problem statements converted to numerical problem statements? Why might one choose a lower rather than a higher level of significance in doing a hypothesis test?
Questions 1- 10 refer to the following: The average weight of newborn infants at a hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0,8.8.,6.8, 8.4, and 6.6 pound. 1. What is the null hypothesis? Ho: The average weight of a baby is 6.6 2. What
In exercise 6 use the listed sample data from car crash experiments conducted b the National Transportation Safety Administration. New cars were purchased and crashed into a fixed barrier at 35 mi/hr. and the listed measurements were recorded for the dummy in the driver's seat. The subcompact cars are the Ford Escort, Honda Civ
The Wall Street Journal recently ran an article indicating differences in perception of sexual harrassment on the job between men and women. The article claimed that women perceived the problem to be much more prevelant than did men. One question asked to both men and women was: "Do you think sexual harrassment is a major pro
The Rocky Mountain district sales manager of JCM, Inc., a college book publishing company, claims that each of his sales representatives makes 40 calls on professors per week. Several reps said that this estimate is too low. To research the claim, a random sample of 28 reps revealed that the mean number of calls made last week w
You are working with an experiment that has a single factor of interest with five groups or levels, and seven observations in each group. You have calculated SSA=60 and SSt=210. At the .05 level of significance, what is the value of the upper-tail critical value from the F distribution? A. 2.69 B. 3.00 C. 3.25 D. 5.00.
The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor's. A sample of 40 babies using the Gibbs products revealed a mean weight of gain of 7.6 pounds in the first three months after birth. The standard deviation of the sample was 2.3 pounds. A sample of 55 babies using
In a particular market there are three commercial television stations, each with its own evening news program from 6:00-6:30 pm. According to a report in this morning's local newspaper, a random sample of 150 viewers last night revealed 53 watched the news on WNAE (channel 5), 64 watched on WRRN (channel 11) and 33 on WSPD ( cha
The chief of security for the Mall of Dakotas was directed to study the problem of missing goods. H selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. For 30 other boxes employees had stolen the goods, and for th
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level. Treatment 1 8, 11, 10, Treatment 2 3, 2, 1, 3, 2, Treatment 3 3, 4, 5, 4, a. state the null hypothesis and the alternative hypothesis b. what is the decision rule? c. Compute SST, SSE
Scenario: The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number
The bank credit card department of Carolina Bank knows from experience that 5 percent of the card holders have had some high school, 15 percent have completed high school, 25 percent have had some college, and 55 percent have completed college. Of the 500 card holders whose cards have been called in for failure to pay their char
1. A social scientist claims that, on average, adults watch less than 26 hours of television per week. Data are collected on the television-viewing habits of 25 randomly selected individuals. This sample indicates that the mean number of hours per week of watching television for an individual is 22.4 hours. a) formulate a sui
I basically created a theory that automated enterprise information systems would save man hours etc... I then collected data to support this in the 10 questions. Now I need to create a couple of hypothesis to support the findings... IE. IF the questions answered show that the workers support having an automated enterprise
1. A financial planner wants to compare the yield of income and growth oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income-oriented and 40 growth-oriented funds The mean increase for a two year period for the income funds is $1100 with a standard deviation of $45. For the growth-oriented fu
You are the member of the marketing team at Sara Bellum's Pizza - the pizza for people who think too much!! Your mission is to evaluate two locations and determine if there is any difference in their suitability as locations for the next Sara Bellum Pizza restaurant. You will use a level of significance of 0.05. The loca
Difference between actual and reported GPA. See attached file for full problem description.
5. Do a quick Tukey test for the following two data sets. Bob: 140,155,160,170,205,220 Diane: 170,210,215,220,225,240,250,260 How many above and below points do you have? How many ties do you have? How many total points for the ties? How many overall total points do you have? What conclusions can you make at a 2 tail 5%
8. A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3. According to the company, 35% of their customers preferred Brand 1, 35% preferred Brand 2, and 30% preferred Brand 3. The telephone survey found that 40%
1. The idle times during the eight-hour day shift and the night shift are to be compared. A time study revealed the following numbers of minutes of idle time for eight-hour periods. Day shift: 92, 103, 116, 81, 89 Night shift: 96, 114, 80, 82, 88, 91 Is there a difference in the idle time between the two shifts? T
An investor who can correctly forecast the direction and size of changes in foreign currency exchange rates is able to reap large profits in the international currency markets. Predictions from 216 investors, together with the subsequent actual directions of change were recorded (Column 1: "predicted change" where 1 = positive a
Testing of Hypothesis. See attached file for full problem description.
A restaurant that bills its house account monthly is concerned that the average monthly bill exceeds $200 per account. A random sample of twelve accounts is selected, resulting in the sample mean of $220 and a sample standard deviation of $12. The researchers have determined that they should test that the mean bill exceeds $200
Question 44: (2 points) A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40. Use the histogram to answer the question. The blood pressure readings were given to the nearest whole n