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Four research participants take a test of mannual dexterity (high scores mean better dexterity) and anxiety test (high scores mean more anxiety). Scores are as follows:
Person dexterity anxiety
1 1 10
2 1 8
3 2 4
4 4 -2
a) Make a scatter diagram of the scores
b) Describe in words the general pattern of correlation, if any;
c) Figure the correlation coefficient
d) Figure weather the correlation is statistically significant (use the .05 significance level, two-tailed)
e) Explain the lodgic of what you have done, writing as if you are speaking to someone who has never heard of correlation.
f) Give 3 logically possible directions of causality.
The Appliance Center has six sales representatives at their North Jacksonville outlet. Listed below is the number of refrigerators sold by each last month.
Of those customers using extra unleaded or premium gas, 60% fill their tanks. What is the probability that the next customer fills the tank?
As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?
The quality control manager at a lightbulb factory needs to determine whether the mean life of a large shipment of lightbulbs is equal to the specified value of 375 hours.
Compare these with the percentages specified by Tchebysheff's Theorem.
Determine the control limits for the mean and the range. Plot the control limits for the mean outside diameter and the range.
Share 1 real-world binomial distribution situation and 1 real-world Poisson distribution situation. Be sure to explain why each example is defined as binomial or Poisson.
How do we decide if the homogeneity of variance assumption is significantly violated?
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Solve different inventory control problems using an appropriate OR method.
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
Given the following data, use exponential smoothing with a=0.2 and a=0.5 to generate forecasts for periods 2 through 6. Use MAD and MSE to decide which of the two models produced a better forecast.
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