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A professor gives an exam for which there are two versions, A and B. Each student in the class is given one randomly selected version of the exam. After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assume a= 0.05.
Version A = sample size 45, mean score is 8.8 and the sample variance of 2.6
Version B = sample size 65, mean score is 8.2 and the sample variance of 2.4
What is the test value for this hypothesis test?
What is the critical value(e) for this hypothesis test? If there are two critical values, give only the positive value.
The Elixer Drug Company produces a drug from two ingredients. Each ingredient contains the same three antibiotics, in different proportions. One gram of ingredient 1 contributes 3 units, and 1 gram of ingredient 2 contributes 1 unit of antibiotic 1; ..
12) The time it takes to process phone orders in a small florist/gift shop is normallydistributed with a mean of 6 minutes and a standard deviation of 1.24 minutes.a. What cutoff value would separate the 2.5% of orders that take the most time ..
Find the probability
Descriptive statistics (5-number summary, mean, mode, range and standard deviation) for each of the four variables along with an explanation of what the descriptive statistics tell us about the motion picture industry.
Descriptive Statistics Project Descriptive Statistics Project Project #1 This project gives you the chance to use all of the statistical techniques and concepts that are covered in the initial chapters of the text.Data Collection: This is an open e..
Write the null and alternative hypotheses and analyze the data using PROC TTEST, and turn in the printout. From this, you will first have to test if the population variances are equal.
Statistics play an important role in understanding the construct of personality. With SPSS, comparison of means analyses can be conducted to promote a greater understanding of personality. View the following: SPSS for Beginners 6a: One-sample t-tests..
A computer services company sells computer services to industrial users. The company's analytic officer has predicted the need for growth to meet competitive pressures. To implement this strategy, upper management has determined that the company wou..
1) A sample of price of 16 different models of mobile in a store are as follows: 900 300 340 450 280 220 340 290 370 400 310 340 430 270 380 910 a) Calculate the mean, median, mode, first and third quartile. b) Calculate the variance, standard deviat..
What is the standard error of this difference between the two means?
How did the media article do at explaining the findings? Is their summary accurate or misleading? Although the article may contain statistical concepts beyond the level of this class, it will most likely be based in things that we are learning...
Scores by women on the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6. Assume that the two tests ..
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