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You collect a sample of 100 observations on monthly spending on fast food. The sample mean is $96 and the sample variance is 400. Test the null hypothesis that the population mean is $100. Show your work.
Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.
Before giving the denition of the binomial probability distribution, try to derive it by using the sample-point approach. How?
What are the theoretical considerations of hypothesis testing and why are these considerations important when conducting research studies?
Is there sufficient evidence for concluding that true average repair time exceeds 200 min? Carry out a test of hypotheses using a significance level of .05.
A thorough examination reveals that there is nothing wrong with the filling machine. From a statistical standpoint, was there a type error made? If yes, which type? Explain.
A researcher administers a treatment to a sample of n = 25 participants and uses a hypothesis test to evaluate the effect of the treatment.
What differentiates a z test statistic for a population from the z statistic for a sampling of means? Why is there a difference? Consider a normal population with ? = 43 and ? = 5.2. Calculate the z-score for an x ? of 46.5 from a sample of size 16.
Construct a scatterplot, find the value of the linear correlation coefficient r, and find the P- value using a= 0.05. Is there sufficient evidence to conclude that there is a linear correlation between systolic measurement and diastolic measuremen..
It takes between 6 to 7.5 hours to drive from Panama City to Boquete, and the drive time is uniformly distributed.
Write a correct null and alternative hypothesis for testing the claim that the mean life of a battery for a cell phone is at least 115 hours.
A nurse reading this finding knows that the researcher should decide that there is not enough information to decide on statistical significance.
5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
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