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WorksheetsSpring Semester Stats Review
Total questions: 10
Worksheet time: 5mins
A binomial distribution is an example of a continuous distribution.
True
False
Which criteria does a Poisson distribution need to meet?
BIFS: Binary outcomes, Independent trials, First occurrence, Set probability for Success
BINS: Binary outcomes, Independent trials, set Number of trials, Set probability for Success
PINT: Probability of x occurrences in set interval, Independent occurrences, constant Number of occurrences per interval, set Time interval
Which two distributions complement each other - one looking at the probability of a set time between arrivals and the other looking at when the first arrival will occur?
Exponential and binomial
Binomial and Poisson
Exponential and Poisson
Normal and binomial
Suppose warehouse heights are normally distributed, with a mean of 22 feet and standard deviation of 4 feet. What will be the computer input if you are trying to find the probability of a warehouse having a height of at most 17 feet?
normcdf (LB = - inf, UB = 17, mean = 22, SD = 4)
normcdf (LB = 17, UB inf, mean = 22, SD = 4)
A bank has an average random arrival rate of 3.2 customers every 4 minutes. What is the probability of getting exactly 10 customers during an 8-minute interval? Name that distribution.
Normal
Binomial
Exponential
Poisson
Which of the following is a valid null hypothesis statement:
H0: μ<42
H0: μ>42
H0: μ= 42
Ha: μ= 42
A bank has an average random arrival rate of 3.2 customers every 4 minutes. What is the probability of getting exactly 10 customers during an 8-minute interval? What do you put into the calculator?
Poispdf ( lambda 3.2, x = 10)
Poispdf (lambda 6.4, x = 10)
Poiscdf (lambda 3.2, LB 10, UB inf)
Poiscdf (lambday 6.4, LB 10, UB inf)
The cookie company claims their chocolate chip cookies contain 25 chips per cookie on average. The consumer advocate doesn't think this is correct. Is there convincing evidence that the cookies don't have 25 chips? What are you being asked to do?
Conduct an hypothesis test
Construct a confidence interval
Construct a confidence level
α=.01 and p−value = .009 What conclusion do you draw for your significance test?
Reject H0
Accept H0
Fail to reject H0
Accept Ha
H0: Hanging the rain rock does not keep the weather dry for Night in Old San Antonio (NIOSA)
Ha: Hanging the rain rock does work to keep the weather dry for Night in Old San Antonio (NIOSA)
The organizers cancel NIOSA for the evening, but it stays dry that evening. Which type of error was made by the organizers?
Type I
Type II
