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1. You saw 3 inferential tests last week Large sample Z small sample tThink of a measurable problem you know of and tell whether you would use a Z test or a t test Tell me why ( more than just being driven by sample size ) and describe the hoped for result 2. Paired sample means tests are used when there is no historical data. Give me one example and some rationale where you would see a reason for wanting to use a paired sample means test 3. A typical recommendation from an inferential test is to either not Reject the null implying no statistical difference in the means or to reject implying there is a statistical difference in the means. Usually the person giving the recommendation will include the confidence level ( aka the Alpha ) and will usually say "with a small chance of statistical error"What is this statistical error and what do you think about this thing called error?4. You just finished getting your data, made sure there were no fliers and the data was correct You created a mean and standard deviation and ran your Z test at the 0.05 alpha Your decision rule is 1.645 and your Z test statistic ( step 3 ) is 1.647
What do you do ( reject or not ) and how do you feel about your decision
If 700 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?
Can you think of other cases where the expected probabilities do not quite agree with the empirical values based on relative frequency?
Construct a scatter plot of P-RFM and P-HELM. If drawing the plot by hand, use graph paper to ensure accuracy.
The mean life time of the sample of 160 tires will be less than 39,000 miles? Interpret the probability in terms of the truth of the manufacturer's claim.
If the basket ball player is a 74% free throw shooter, then, on average, how many free throws will he or she make in a game with eight free throw attempts?
Produce trucks arrive at the weigh station at the California border at a rate of 3 per hour according to a Poisson distribution. Livestock trucks arrive at that same weigh station at a rate of 2 per hour according to a Poisson distribution.
A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows:
Why use the Wilcoxon T test. What is the hypothesis statements you used? Consider do we prefer working with dependent samples or independent samples? Explain
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of µ = 80 and a standard deviation of σ = 20. The researcher expects a 12 point treatment effect and plans to use a ..
Last week I used a stopwatch to measure the echo time of my snare drum in the hall outside my classroom, which is 80 meters long. The average echo time was 10 milliseconds.
When is regression used? What are the assumptions of Linear Regression? What is correlation? How does it differ from regression? What is the interpretation of the correlation coefficient?
Do you think the state has any intention of ever stopping the lottery, given the fact that the state relies on it to bring millions of dollars into its treasury?
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