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There are 12 fathers and 15 mothers who have offered to chaperone a school trip. 6 of these parents are chosen at random.
a. What is the probability that exactly 3 of these are mothers?
b. What is the probability that at least 2 of the mothers are chosen?
What is statistical significance? If we randomly assign subjects to two groups we would expect there to be some difference in the groups just by chance. If a difference is statistically significant then it is large enough that we would not expec..
We flip a coin 100 times (n = 100)and note that it only comes up heads 20% (p = 0.20)of the time. The mean and standard deviation for the number of times
How many units should the company currently have in stock so that it can be 98% certain of not running out during this three-week period?
Take a confidence interval for the difference in the average of renting between the first andthird hotel.
Use the Excel directions below to make a scatter plot for the Temperature in Fahrenheit and the number of cricket chirps per sec.
Is there any evidence to suggest that the true proportion of Canadians who are concerned about privacy protection is different from 67% in any province? Justify your answer.
Suppose only one person in your survey has a chronic heart condition. What is the probability of getting one or fewer people with a chronic heart condition.
Devina believes that (on any particular play of the game) she has about a 15% chance of winning something on a certain instant lottery she plays.
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour.
Maxwell Manufacturing makes two models of felt tip marking pens. There are 3 processing steps required for the pen production. Times (hours) are given in the table below.
Compute the relative risk of meeting their goals for the experimental and the control groups.- Compute the odds ratio of meeting their goals for the two groups and give 95% confidence intervals.
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