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A university president believes that over the past few years the average age of students has increased. To test this hypothesis, an experiment is conducted in which the age of 150 randomly selected students is measured. Their mean age is 23.5 years. A complete census taken at the university a few years prior indicated a mean age of 22.4 years with a standard deviation of 7.6 years. Test the null hypothesis at the .05 level.
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At the .05 significance level, is there a difference in gas mileage for the different types of gas? Write out your null and alternative hypotheses for the problem and state what the finding means practically.
In a recent study of 86 working adults, the mean number of hours per week spent talking on the phone was 21.6. The sd= 5.7 hours.
What is a test of a proportion and give an example. What test do you use when one sample is small and the other large?
Likert scale- based questionnaire & responses for 30 respondents showing the number of respondents for each respond option
a) Do a test to see if workers attitudes on this matter have changed using a 90% alpha. b) Explain to management what your findings are and what this suggests about future decisions vs work options.
A standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be greater than 122.
Conceptually we would expect the probability of newborn males and females to be the same. However, census reports indicate that the ratios of males and females in various countries do not conform to the theoretical prediction.
You are told that twenty-five percent of the player names in the hat are quarterbacks and that forty percent of the players in the hat have Porsches in their garage at home. What is the likelihood that you will get to go to lunch with a quarterbac..
The standard deviation was 2. At α = .10, is the number of years' experience of the taxi drivers really less than the taxi company claimed?
What type of data would you obtain from a rating scale? Prove an application/example in your response of how this instrument could be used. For what population would you use a graphical rating scale?
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
Convert Alisha's grandmother's score to a z score among the distribution of exercise capacity in Americans over seventy years old. Who has a relatively longer exercise capacity compared to her peers-Alisha or her grandmother?
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