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A researcher claims that the average age of people who buy lottery tickets is 61. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 9. At ? = 0.05 is there enough evidence to reject the researcher's claim? Show all work.
the following are mood scores for 12 participants before and after watching a funny video clip higher values indicate
The new director of special programs in XYZ Corporation felt the customers were waiting too long to receive and complete forms needed to enroll in special programs.
1.you decide to test a friend for esp using a standard deck of 52 playing cards. such a deck contains 13 spades 13
Let denote the sample mean viewing time. What is the probability the sample mean will be within 0.25 hours of the population mean?
The important thing is having a reason for picking the model that you decide on. You should choose a model for overall characteristics like a high R^2 value. Y
To perform a certain type of blood analysis, lab technicians must perform two procedures. The first procedure requires either 1 or 2 separate steps, and the second procedure requires either 1, 2, or 3 steps. a) List the experimental outcomes assoc..
The student newspaper on our campus was interested in binge drinking. For their article, they surveyed 50 fraternity members, and found they drink more than 5 drinks an average of 7 times per month.
Estimate the area under the Normal Distribution from the mean to a z-score of -2.07. Estimate the z-score that corresponds to an area of 0.5557 under the Normal Distribution.
She then uses the mean and standard deviation of these values to estimate the mean value for all parts the operator is making. Construct a 95% confidence interval for the mean value assuming a normal distribution.
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
What is the expected number of crimes that will be solved? What is the standard deviation?
Use 9 classes. Is the histogram approximately bell shaped and symmetic? Does this agree with the results predicted by the Central Limite Theorem?
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