Statistics Quiz with Solutions (5 Questions)

by Electra Radioti
statistics quiz
statistics quiz

Statistics Quiz with Solutions (5 Questions)

Statistics Quiz with Solutions (5 Questions)

1 / 5

A kindergarten teacher wishes to estimate, to within 3 minutes, the mean time a child takes to arrange a jigsaw puzzle in the class with 90% confidence. Estimate the minimum size of sample required if the standard deviation of arrange times for the other kindergarten class is 4.2 minutes.

2 / 5

Which of the following is not a random variable?

3 / 5

A continuous random variable X has a normal distribution with mean 50. The probability that X takes a value greater than 55 is 0.25. Using this information and the symmetry of the density function, which of the following is the probability that X takes a value less than 45?

4 / 5

A sample of size 25 drawn from a normally distributed population has a sample mean 12 and a sample standard deviation 5. Construct an 80% confidence interval for the population mean.

5 / 5

The observed significance of a test of hypotheses is the area of the tail of the distribution cut off by the _____.

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