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Explain the difference between the null and alternative hypothesis. Which one can be proven in a statistical sense?
In past, mean processing time was 45 days. At 0.05 level of significance, is there evidence that mean processing time has changed from 45 days?
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
If you were using the relative frequency of an event to estimate the probablility of the event, would it be better to use 100 trials or 400 trials according to the law of large numbers?
SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 116. a) what percentage of SAT scores are between 399 and 631?
Critically discuss some examples of literature reviews and statistics used and available at your work place or organization? What are they used for and how are they determined?
The length of a Colorado brook trout is normally distributed. What is the probability that a brook trout's length:
There is a probability that the river will flood next year. Riverside's profits for the coming year depend on whether Laura buys the flood insurance and whether the river floods.
A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different.
Let Z be a standard normal random variable. Calculate the following probabilities using the calculator provided. Round your responses to at least three decimal places.
Which of the following statements is true regarding a nonparametric test?
The following data were obtained from an independent measures research study comparing three treatment conditions. Use an ANOVA with alpha=.05 to determine whether there are any significant mean differences among the treatments.
For each of the following, indicate whether or not you would expect it to have a strong seasonal component and why.
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