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Q1) A random sample of ages of 51 college students has mean of 15. Population is known to be normal with standard deviation of 2.
a) Compute standard error of mean?
b) Compute the margin of error, with 95% confidence.
Q2) Average hourly wage of workers at fast food restaurant is $6.50/hr with standard deviation of $0.45. Suppose that distribution is normally distributed. If worker at this fast food restaurant is chosen at arbitrary, determine probability that worker earns more than $6.75?
a) 28.77%
b) 27.64%
c) 42.07%
d) 5.17%
Q3) Recent study found that average life expectancy of person living in Africa is 53 years with a standard deviation of 7.5 years. If person in Africa is chosen at random, determine the probability that person will die before the age of 65?
a) 94.52%
b) 82.89%
c) 94.95%
d) 88.49%
Is there evidence of difference in median performance between two methods? (Use α = 0.05.)
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
The p-value of the test is closest to:
36 values given here are based on summary statistics from research by cumming. Do you think that these data are normally distributed?
would this prove that they are exceeding their goal, using α = .025?
The Minneapolis Tribune ran an article on gender differences in shopping behavior. When 400 women were asked to respond to the question "Where I shop is influenced by which store has a greater variety," 60% answered "Yes.
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the linear regression model:
Be sure the appropriate assumptions and conditions are satisfied before you proceed.
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
Which of the following measures only the strength of a relationship?
Calculate the suitable mean response time from both proposed locations and find out which proposed site must be selected for the new emergency facility.
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