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1) In research we often rely on the 68-95-99.7 rule. Discuss how this can be applied to make statements about the number of data values below 1,2, or 3 standard deviations from the mean. Give an example of application of this rule.
2) In a research study, what does statistically significant mean? How are decisions made on data based on significance? What do you do with data that is not significantly different?
If you suppose returns follow normal distribution, which investment would give better chance of getting at least a $40MIL return and describe why.
The Swansons are planning to fly to Hawaii from Toronto with a stopover in Los Angeles. There are five flights they can take between Toronto and Los Angeles and ten flights between Los Angeles and Hawaii.
Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.
A production process is known to produce a particular item in such a way that 5 percent of these are defective. If two items are randomly selected as they come off the production line
Ten pairs of points yielded a correlation coefficient y of 0.79. If a=0.05, which of the following statements is correct if H 0:P=0? (Do not calculate a t-value.)
A random sample of 50 engineers of a large technology company that the sample mean is 34.4 year. assume that the population standard deviation is 8 years.
The table below shows the scores of a group of 15 students in mathematics and art: Determine if the locations of distribution of scores for these students differ significantly for the two subjects. Use the hand calculation method and then use PHSta..
Illustrate how critical values associate to the confidence interval using example variable. Explain how margin of error associates to confidence intervals and to ecology.
An instructor in a Statistics course teaches in two classes: Class A and Class B. Class A has 16 students while class B has 25 students. On the same examination, although there was no significant difference in the mean grades, class A had a standa..
Florida State University administers a mathematics placement test to students where they 1st enter the university.
It is asserted that a greater proportion of males (= x 1 ) contribute to charity than females (= x 2 ). A survey of male and female contributors to charity showed that of 900 males surveyed
Discuss the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution?
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