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High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is:
a) 0.4678
b) 0.0829
c) 0.8527
d) 0.3849
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, & 10.
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. make an interference based on the results of the study.
Note that Σ x = 2233 and Σ x 2 = 138,053. At the 5% level of significance, can the instructor conclude that the new mean is different from 64?
Computing the Z scores for the given data and evaluate µ and σ for the population.
If customers arrive according to a non-stationary Poisson process with rate function λ(t) = sin(t) + 5, is the time between the arrivals an exponential distribution?
Determine the probability of having more than 3 defects in a roll?
Using the empirical rule what percentage of adults is 25 - 45 has iq score bet 70 and 130.
Jim and Mike go to a coffee shop during their lunch break and toss a coin to see who will pay. The probability that Mike will pay three days in a row is 0.125.
Construct a 99% confidence interval on the population mean height of all 1-year-old pine seedlings. What are the confidence limits? What statement can be made about the population mean height using the confidence interval?
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
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