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People in a large population average 60 inches tall. You will take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall. For example, if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size 1,000? Choose one and explain. Does the law of averages relate to the answer you give?
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
Standard deviations for first- and second-time and confidence interval
Below you are given a partial computer output based on a sample of 21 observations, relating an independent variable (x) and a dependent variable (y).
To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 25 children diagnosed with the disorder and measure each child's attention span before and after taking the drug.
At the .01 significance level, is there a difference in the use of the four entrances?
Estimate and interpret the p-value of the calculated test statistic above.
Find the probability of getting a head and rolling a six
The number of degrees of freedom corresponding to between treatments is:
Draw the decision tree and perform a decision tree analysis of Steeley Associates decision situation using expected monetary value and what is the value of the information provided by Bernard Consultants (EVSI)? Give a recommendation as to whether ..
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
Find the t c for a 90% confidence level with a sample size of 18.
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