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Changing the alternative hypothesis. Refer to the previous exercise. Does your conclusion change if you test whether the proportion of men who favor Commercial A is larger than the proportion of females? Explain.
Exercise Gender and commercial preference: the z test. Refer to Exercise 1. Test that the proportions of women and men who liked Commercial A are the same versus the two-sided alternative at the 5% level.
Exercise 1Gender and commercial preference. A study was designed to compare two energy drink commercials. Each participant was shown the commercials in random order and asked to select the better one. Commercial A was selected by 44 out of 100 women and 79 out of 140 men. Give an estimate of the difference in gender proportions that favored Commercial A. Also construct a large-sample 95% confidence interval for this difference.
one prominent physician claims that 70 of those with lung cancer are chain smokers. if his assertion is correct the
What does central limit theorem say about distribution of John's average payoff after 365 bets in a year?
Approximate y(1) using Euler's method and step sizes of 0.2. Perform these calculations by hand. What is the exact value of y(1)?
1. identify a commonly used graphical technique for portraying events and relationships among events.2. what does it
Create a correlation table for the variables in our data set and Perform a regression analysis using compa as the dependent variable and the same independent variables
A health insurance company charges policyholders a $1250 annual premium for health insurance for hospitalization. Find the insurance company's expected profit per policyholder
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
for a particular study at the 5 significance level we were able to reject a null hypothesis that two population
analyze and discuss how organizational attitudes and ethics can play a role in your success or
a survey of 25 randomly selected customers found the ages shown in years. 28 36 40 26 33 24 11 47 23 33 46 38 35 14 33
Dr Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 30 men and 70 women. In this group four persons were African American, six persons were Hispanic and ..
The scores of the GRE exam are transformed so they have a mean of 500 and standard deviation of 100. The scores are known to be normally distributed. What is the percentage of students that score below 750?
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