The pooled variance is used to calculate the test statistics for comparing two population means when the population variances are assumed to be unequal.
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Q. 2Bananas are sold in bunches at a grocery store and typically consist of 4-8 bananas per bunch. Suppose the weight of these bunches follows a normal distribution with a mean of 3.54 pounds and a standard deviation of 0.63 pounds.
What is the probability that a randomly selected bunch of bananas will weigh more than 3.0 pounds?A) 0.5398
B) 0.6950
C) 0.8051
D) 0.9463
Q. 3When testing for the population mean when sigma is known and a sample size is greater than 30, the population must be normally distributed in order for the conclusions to be reliable.
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Q. 4________ probability is the probability of Event A occurring knowing that Event B has already occurred.
A) Joint
B) Conditional
C) Prior
D) Marginal
Q. 5The pooled variance is the weighted average of two sample variances drawn from two populations.
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