StreetInsider.com reported 2002 earnings per share data for a sample of major companies (Feb. 12, 2003) Prior to 2002, financial analysts predicted the 2002 earnings per share for these same companies (Barron's Sep. 10, 2001) Use the following data to comment on differences between actual and estimated earnings per share. C
Bob's Candies Bob loves making candy, especially varieties of caramel, including plain, chocolate dipped caramels and chocolate dipped caramels with pecans. Bob has received lots of compliments from his friends and neighbors, and several have encouraged him to start his own candy making business. After several days of res
Using a significance level of 0.05 I want to conduct 3 hypothesis tests using the data below. I need to state my alternative and null hypotheses and test a claim about a proportion. I would like my claim to be that over 50% of movies made cost over 1 million dollars to make. If that is not a good claim to use in order to give
Here is what I need help with. You can use any of the below information to get the answers. Please use the first set of results for the first one though. I am in the military and I took a granade launcher and launched 30 rounds at a target and then measured how far from the target I was. Just so that you understand it is
Please see attached for fully formatted questions. ================================== 12. The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. a. What is the value of t
1.Define the term "hypothesis"; what is a hypothesis test? 2. List and describe two types of error that can occur in hypothesis testing. 3. An independent testing laboratory has been commissioned to determine the relative fuel economy of cars, light trucks, and sport utility vehicles. A random sample of 200 within each cat
1. 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 significantly lo
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major. Research question: At α = .01, is the degree of certainty independent of credits earned? Credits Earned Very Uncertain Somewhat Certain Very Certain
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during the Spring 2007 semester at Iowa State was selected. The prices for these textbooks at both Iowa State bookstore and through Amazon.com were recorded. The prices for the textbooks, inclu
Suppose a study is constructed to test a claim, at a 0.05 significance level that a population proportion is 40%. A simple random sample of 750 subjects has a proportion of 42%. Determine the test statistic, critical value z = + or -, determine the p value.
Does the type of display used in a supermarket affect the sales of products? As the regional sales manager for Aldi's Foods, you are interested in comparing the sales volume of Aldi's cola when the soft drink is displayed in the normal shelf location as compared to an end aisle promotional display. to test the effectiveness of t
A real estate agency wants to estimate the difference in the appraised values of single-family homes in two communities. A sample of 60 listings in Strongsville and 99 listings in Brunswick yields the following results (in thousands of dollars). Strongsville, Ohio: sample mean (1)= 191.33 Brunswick, Ohio: sample mean (2)=
A study was performed to determine if males who quit exercising gain weight. Eight male adults were weighed before they stopped exercising. They were weighed five weeks after they stopped exercising. Is there sufficient evidence at alpha = 0.05 that the males who quit exercising gain weight? Subject 1 2 3 4 5
How tall are college hockey players? The average height has been 68.3 inches. A random sample of 14 hockey players gave a mean height of 69.1 inches. We may assume that x has a normal distribution with σ = 0.9 inch. Does this indicate that the population mean height is different from 68.3 inches? Use 5% level of significan
1. You are interested in the effect of how the age of students VS affects their grades in college. To test the effect you setup a study to analyze the affect that a student's age has on their grades in college. You divide the students into groups and record their overall GPA in college. The results follow: Source of Variatio
Use alpha = 0.05 unless specified otherwise. For each hypothesis test state HA (the research hypothesis) and H0 (the null hypothesis) using the proper symbols. (You can type mu or sigma for the corresponding symbols.) Include a "summary statement" for each hypothesis test. A formal Summary Statement is REQUIRED as part of al
Use alpha = 0.05 unless specified otherwise. For each hypothesis test state HA (the research hypothesis) and H0 (the null hypothesis) using the proper symbols. (You can type mu or sigma for the corresponding symbols.) Include a "summary statement" for each hypothesis test. A formal Summary Statement is REQUIRED as part of al
The manager of a local branch of a bank believes that over the past few years the bank has begun to cater to a different clientele and that the average amount withdrawn from its ATMs is no longer $140.00. State the null hypothesis Ho and the alternative hypothesis H1.
The following data represent samples of size 45 which were drawn randomly from the graduating classes of three competing high schools ... Construct a 98% confidence interval for the population mean SAT of the of students from High School 1. Test the appropriate hypothesis to examine if High Schools 1 and
Suppose that 9 observations are drawn from a normal population whose standard deviation is 2. The observations are: 15, 9, 13, 11, 8, 12, 11, 7, and 10. At 95% confidence, you want to determine whether the mean of the population from which this sample was taken is significantly different from 10. Compute the value of the tes
The solution addresses: Three different relaxation techniques are given to randomly selected patients in an effort to reduce their stress levels. A special instrument has been designed to measure the percentage of stress reduction in each person. The data is shown below. You can assume normality and that good randomization an
The solution addresses the following. A new weight-watching company advertises that those who join will lose, on average, 10 lbs. the first two weeks. A random sample of 50 people who joined revealed the mean loss to be 9 lbs. with a standard deviation of 2.8 lbs. At the .05 level of significance, can we conclude that those
Confidence Interval for Effects of Alcohol: An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of people who drank ethanol and another group given a placebo. The results are shown in the accompanying table (based on data from "Effects of
In a study of women and heart disease, the following sample results were obtained: Among 10,239 women with a low level of physical activity (less than 200 kcal/wk), there were 101 cases of heart disease. Among 9877 women with physical activity measured between 200 and 600 kcal/wk, there were 56 cases of heart disease (based on d
Please see attachment for fully formatted question. 10.30 Note: For tests on two proportions, two means, or two variances it is a good idea to check your work by using MINITAB, MegaStat, or the LearningStats two-sample calculators in Unit 10. In Dallas, some fire trucks were painted yellow (instead of red) to heighten the
5. A recent survey of 800 TV viewers found 44% watched NBC news. The margin of error was reported as 3.4%. Using a 95% level of confidence, show how this margin of error was obtained. , list =?, p=?,q=?,n=?, SE=?
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of
A sample of high school seniors showed that 18 of 60 who owned PlayStation 3 spent more than an hour a day playing games, compared with 32 of 80 who owned Xbox 360. Is there a significant difference in the population proportions at alpha = .10?
Hypothesis testing with one sample Testing a Claim About a Standard Deviation or Variance Systolic Blood Pressure for Women: Systolic blood pressure results from contraction of the heart. Based on past results from the National Health Survey, it is claimed that women have systolic blood pressures with a mean and standard de
Testing a Claim About a Standard Deviation or Variance Systolic Blood Pressure for Women: Systolic blood pressure results from contraction of the heart. Based on past results from the National Health Survey, it is claimed that women have systolic blood pressures with a mean and standard deviation of 130.7 and 23.4, respective