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Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
questions1 write introduction to spc statistical process control?2 explain the use of spc tools used at d2d?3 how could
Suppose the people living in a city have a mean score of 48 and a standard deviation score of 7 on a measure of concerns about the environment.
If only one bolt is chosen, determine the probability that it will be found defective for only 1 reason (that is. it is either too large or has poor workmanship, but not both.)
Conditions to perform inference in regression
How large a sample is needed to estimate the true proportion of covered children with 90% confidence with a confidence interval of .05.
Find an equation of the least squares regression line. Please show your work. Is there a linear correlation between "x" and "y" at the 0.01 significance level? Please justify your answer.
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the oth..
How many different sets of exactly 20 of the 23 people with reservations for coach seats are possible? (do you use permutations or combinations?)
Do you think an F-ratio of 1 would lead you to conclude that there is no treatment effect? Why? Justify your answers with examples.
Suppose no calls are currently being processed (either on hold or in progress), what is the probability that the Helpdesk will receive the next call within the next 10 minutes?
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