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A hospital administrator wanted to know if the nurses at her hospital preferred one brand of stethoscope over another. She gave 3 nurses a different stethoscope to try out each week and asked them to rate their liking for that stethoscope on a scale of 1 to 5 (1 = hated it, 5 = loved it). Was there any difference in the nurses' preference in brand (α = 0.05)? Show all necessary components of a full hypothesis test, including a source table.
Nurse
Littmann (A)
Prestige Medical (B)
ADC (C)
1
5
3
2
4
The diameters of oranges in the certain orchard are normally distributed with the mean of 5.26 inches and a standard deviation of 0.50 inches.
We say that two things have a positive relationship if they move in the same direction, or as one thing increases, so does the other. Or if one thing decreases, so does the other.
In a second grade class containing 12 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the probability that both are girls?
Describe the difference in the fit provided by the two estimated regression equations.
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Why do we want to assume that our sample data represent a population distribution? What are the differences between the binomial and normal distributions?
A study of 200 apples trees showed that the average number of apples per tree was 1000. The standard deviation of the population is 200. Which of the following is the 98% confidence interval for the mean number for all apples.
Explain this result (including the underlying logic of the computations) to a person who understands hypothesis testing involving a single sample and a known population, but knows nothing about t tests.
A confidence interval increases in width as:
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
Suppose a coin is flipped and a die is rolled. Let E1 denote the event "the coin shows a tail", let E2 denote the event "the dies shows a 3", and let E3 denote the event "the coin shows heads and the die shows an odd number".
Determine probability, P(Z
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