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One sided or two? In each of the following situations, is the alternative hypothesis one-sided or two-sided? What are the hypotheses?
a) A business student conducts a taste test to see whether students prefer Diet Coke or Diet Pepsi.
b) PepsiCo recently reformulated Diet Pepsi in an attempt to appeal to teenagers. They run a taste test to see if the new formula appeals to teenagers more than the standard formula.
c) A budget override in a small town requires a twothirds majority to pass. A local newspaper conducts a poll to see if there's evidence it will pass.
d) One financial theory states that the stock market will go up or down with equal probability. A student collects data over several years to test the theory.
The Ohio Department of Agriculture tested 203 fuel samples across the state in 1999 for accuracy of the reported octane level. For premium grade, 14 out of 105 samples failed
Based on your answer to part a, are you convinced that the gaskets from shift 2 are, on average, wider than those from shift 1? Why or why not?
find the z-scores that separate the middle 71 of the distribution from the area in the tails of the standard normal
A standard deviation of $20, obtain the probability that a monthly landline phone bill for a household is less than $100.
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
A "pressure cooker" is a device that allows food to be cooked at pressures that are higher than atmospheric pressure. Explain why this device changes how your food is cooked.
A standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
In a survey of 500 individuals, it was found that 155 of the 500 rented at least one video from a video rental store during the past week. Test the hypothesis that 25% of the population rented at least one video during the past week using a two-ta..
HI6007 SPSS Assignment 02. The data set you need to do the assignment can be found on Blackboard in the folder "Assignments and due dates" and in the spreadsheet "Data for Assignment 2". What is the significance value? What does the significance va..
Someone tells you that 50% of the tickets in the box show positive numbers. Do you believe it? Answer yes or no, and explain.
What are the critical z-values for a two-tailed hypothesis test - Which statement is correct based on analysis?
Prediction interval for the regression line - Using the age and sick days data from table below, find the 98% prediction interval when x = 47 years.
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