Question: CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 36 randomly selected cameras yielded the following sample values: mean = 7.2 photos/sec S=.52 photos/sec. Using alpha = 0.025, determine the critical value rule.
Step 1: set up hypotheses and determine the level of significance step 2: select the appropriate test statistic step 3: set up the decision rule step 4: compute the test statistic step 5: conclusion (reject Ho or do not reject Ho; also state the conclusion in the context of the problem i.e. " We have statistically si
CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 25 randomly selected cameras yielded the following sample values mean = 7.15 photo/sec S = .58 photo/sec. Use alpha = 0.01. Formulate the null and alternative hypotheses. Note: You will be doing several
In fiscal 1996, the U.S. Agency for International Development provided 238,300 metric tons of corn soy blend (CSB) for development programs and emergency relief in countries throughout the world. CSB is a highly nutritious, low-cost fortified food that is partially cooked and can be incorporated into different food preparations
The producer of a TV special hopes that about 40 percent of the audience tunes in a re-release of a 1965 concert by the Beatles. A sample of 200 households revealed 60% would tune the concert. In a 0.10 significance level evidence suggests that at least 40 percent tune to the concert. Use the general format of the test hypot
Problem Set 1: Chapter 8, problems 2, 4, 6, 10, 12, 22, 24 2. The value of the z- score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant, explain how the value of z is influenced by each of the following: a. increasing the difference between the sample mea
A sample of n=9 score is obtained from a normal population with σ=12 and the sample mean is M=60. 1. Use the sample data to test the hypothesis with a two tailed test and α=.05 and the mean populations is ϻ=65 and ϻ=55.
During the 2008 election the following hypothesis was tested between two independent polling station as to the equality of the vote. Ho: u-u= < 0 - Ha : u-u>0 The following sample results were obtained from the two voting stations. Station-1 Station 2 n=32 n=40 x=22.2
Arnold Palmer and Tiger Woods are two of the best golfers to ever play the game. To show how these two golfers would compare if both were playing at the top of their game, the following data provide the results of 18-hole scores during the PGA tournment competition. Palmer Woods N=112 N=84
Recent recommendations suggest 60 minutes of physical activity per day. A sample of 50 adults in a study of cardiovascular risk factors report exercising a mean of 38 minutes per day with a standard deviation of 19 minutes. Based on the sample data, is the physical activity significantly less than recommended? Run the appropriat
A University employment office wants to compare the time taken by graduates with 3 different majors to find their first jobs after graduation. The following tables lists the time (in days) taken to find their first full time job after graduation for a random sample of 8 business majors, 7 computer science majors & 6 engineering
A dietician wanted to test 3 different diets to find out if the mean weight loss for each of these is the same. She randomly selected 21 overweight persons, randomly divided them into 3 groups, put each group into one of three diets. The following table records the weights (in pounds) lost by each persons after being on these
One Sample Hypothesis Testing Paper Using numerical data from one of the 2005 Real Estate data set, develop one business research question (The research question is "What Affects the Price of a Home)?") from which you will formulate a research hypothesis that will test two or more populations (HO: the price of a home is less
A newspaper article discussed the opening of a Whole Foods Market in the Time=Warner building in NYC. The following data compared the prices of some kitchen staples at the new Whole Foods Market and at the Fairway supermarket. Items Whole Food Fairway milk 2.19 2.39
The quality control manager at a lightbulb factory needs to determine whether the mean life of a large shipment of lightbulbs is equal to the specified value of 375 hours. State the null and alternative hypotheses.
8. A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% As, 26% Bs, 31% Cs, 19% Ds, and 10% Fs. A sample of n=200 psychology students from last semester p
Consumer Reports magazine tested paints. The table below shows the overall quality score and cost in dollars per gallon. Test for a correlation. Based on these results, do you get better quality paint by paying more? Quality 90 87 87 86 86 86 82 81 78 62 61 59 23 Cost 27 32 34 30 20 19 19 36 15 39 24 25 15 (i) Te
Plasma TV's Consumer Reports magazine tested large Plasma TV's. The table below shows the rankings of TV's by overall quality score and cost. High values are given low ranks, so the TV with a quality rank of 1 is the TV with the highest quality score, and a TV given a cost rank of 1 is the most expensive. Test for a correlati
6 Marks: 1 Please answer questions 6 - 9 based on the following information. A firm has an order process time of at least 20 minutes. After a change in the process, a researcher wishes to determine if the processing time for orders in a warehouse averages less than 20 minutes, at a 99% confidence level. The researcher uses
See attached file. Compare the proposed and current methods of instruction, an entering class of 122 students was assigned randomly to one of the two methods. One group of 61 students used the current programmed-text method and the other group of 61 students used the proposed computer-assisted method. The time in hours was re
MEALS-ON-TRACKS Contract specifications require (among other things) that Meals-On-Tracks, Inc., deliver 14,400 combat meals with a mean weight of 8.5 ounces. You have been given a technical report with the results of a sample of 25 dry combat meals taken from today's shipment. The sample had a mean weight of 8.0 ounces and a
Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard deviation of 3); the control group has a mean of 35 (with
16. A pharmaceutical company has developed a drug that is expected to reduce hunger. To test the drug, three samples of rats are selected with n=10 in each sample. The first sample receives the drug every day. The second sample is given the drug once a week, and the third sample receives no drug at all. The dependent variable
The following data represent the results from an independent-measures study comparing three treatments. a. Compute SS for the set of 3 treatment means (Use the three means as a set of n=3 scores and compute SS) Treat the means as if they are scores and compute their mean as you would calculate the mean for the scores. Then ob
Wall Street securities firms paid out record year-end bonuses of $125,500 per employee for 2005 (Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones & Ryan securities firm to see whether the mean year-end bonus is different from the reported mean of $125,500 for the population. A. Stat
Using the data below and a 0.1 significance level test the claim that this mean amount of tar in filtered cigarettes is less than the mean amount of tar in unfiltered cigarettes. Do not assume the population standard deviation are equal. Filtered 15 17 17 12 16 3 17 17 9 14 12 13 14 15 14 15 15 16 10 15 11 Unfiltered
1. 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 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 babie
A study conduced a few years ago claims adult men spend an average of 11 hours a week watching sports on tv. A recent sample of 100 adult men showed that the mean time they spend per week watching sports on TV is 9 hours. The population standard deviation is given to be 2.2 hours. a) Test at the 1% significance level whether
In an article about anti-tobacco campaigns, Siegel and Biener (1997) discuss the results of a survey of tobacco usage and attitudes, conducted in Massachusetts in 1993 and 1995; Table 4-4 shows the results of this survey. Focusing on just the first line (the percentage smoking 25 cigarettes daily), explain what this result means
10.30 In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks have a signifi