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Discuss the notations and two properties of probability.
Why do we reject the null hypothesis when the p-value is small? Explain as if to someone unfamiliar with statistics. Why do we divide by the standard error when computing a test statistic?
BUS405 (2015A) - Discuss which statistical tests to apply for different types of data and how to interpret the results. Support your answer with suitable examples and supportive references.
A study was conducted to evaluate the hypothesis that tea consumption and premenstrual syndrome are associated. A group of 188 nursing stu- dents and 64 tea factory workers were given questionnaires. The preva- lence of premenstrual syndrome was 3..
An online store contacts 1000 customers from its list of customers who have purchased something from them in the last year. In all, 696 of the 1000 say that they are very satisfied with the store's Web site. The population in this setting is
ACT, Inc. In 2004, ACT, Inc. reported that 74% of 1644 randomly selected college freshmen returned to col- lege the next year. Estimate the national freshman-to- sophomore retention rate. a) Check that the assumptions and conditions are met for ..
Compute the phi-coefficient for these data and compare it with the result from problem 13. You should find that the sample size has no effect on the strength of the relationship.
If the airlines' goal was to attain the same proportion of on-time arrivals as in 2004, do the preliminary results indicate that they have met this goal? Support your assertions.
What is the 25th percentile of a X² distribution with 20 degrees of freedom? What symbol is used to denote this value?
a town has 20 000 registered voters of whom 8800 are democrats. a survey organization takes a simple random sample of
A researcher conducted an experiment on the effects of a new multivitamin on energy level, with a control group (received nothing), a placebo group
a coin was flipped 60 times and came up heads 36 times. what is the test statistic you would use to test whether the
the height of the water level in mineral water bottles has a mean of 140 mm and a standard deviation of 4 mm. assume
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