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What is an example of two variables that are likely to be correlated because they are both changing over time?
A study of employees at a large company found a negative correlation between weight and distance walked on an average day. In other words, people who walked more weighed less. Do you conclude that walking causes lower weight? Can you think of an alternate explanation for the findings?
What are the null and alternative hypotheses in this situation?
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
Make your calculation supposing a two-sided two-sample t-test with a type I error (alpha) of 0.056
Estimate the probability that the machine will overflow an 8 oz cup.
The lifetime of a light bulb is an Exponential RV with a mean of 800 hours. Let L represent the time (in hours) that one randomly selected light bulb will burn. What is the possibility the light bulb burns for more than 1000 hours.
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
There is no proof the new policy is more effective, but we cannot finish the policy has no effect on smog. Interpretation of P-value for the given context.
What is the best predicted IQ of the wife, given that the husband has an IQ of 105 ? Use a significance level of 0.05.
An advisory group decided to investigate this claim, believing it was too large. A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the 0.01 significance level. Show..
Compute a seasonalized or adjusted sales forecast.
Calculate and plot t he new supply schedule and indicate the new equilibrium price and quantity on your diagram
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
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