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A psychologist would like to examine the relative effectiveness of three therapy techniques for treating mild phobias. A sample of N = 15 individuals who display a moderate fear of spiders is obtained. These individuals are randomly assigned (n = 5) to each of the three therapies. The dependent variable is a measure of reported fear of spiders after therapy. The data are as follows:
Therapy A Therapy B Therapy C8 3 15 3 05 0 17 2 25 2 1
1. Use Hypothesis testing to determine if the data indicate that there are significant differences among the three therapies? Test at the .05 level of significance.Step 1: State HypothesisStep 2: Set CriteriaStep 3: Compute Sample Statistic
Use excel to compute F value
Step 4: Make a decisioni. Did you reject the null/fail to reject the nullii. State your conclusions in your own words
2. Based on the above results can you determine exactly which treatments are different?
Laura wanted to build a multiple regression model based on advertising expenditures and Coffee Time's price index. Based on the selection of all normal values, she obtained the following:
The retail price of 12-pack soda can be characterized as having a normal distribution with a mean of 3.00 dollars and a standard deviation of 0.25. Below what price do you find 30 percent of all 12-packs?
The design tolerance thickness for an automotive part is 55 mm to 65 mm. If the process mean thickness is 61 with a standard deviation of 2.3 mm, then what percentage of the sheets will be acceptable? (i.e. What percentage will fall within the des..
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
In comparing two variances below, determine test value and what are degrees of freedom that must be used?
The Ohio Department of Highways is in the process of selecting a new paint for highway use. Four different paint companies have been contact regarding this need and each of the companies has supplied paint for testing.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
In a survey of the 3000 boy scouts in the National Capital Area Council (NCAC), it is found that they have a mean weight of 135 lbs with a standard deviation of 15 lbs. How many of the boy scouts have weights between 120 lbs and 150 lbs.?
Find the test statistic value for two mean tests in large sample.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were:
Make a histogram for the r probability distribution.
Precisely (that is, using specific numbers) what does the central limit theorem tell us about the sampling distribution of sample means for samples of this size from this population?
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