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In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that my be present in the studies as they are describe here.
a) In a sample of 50 members of a local health club you find that 12 of these members meet weekly with a physical fitness trainer and that the average body mass index (BMI) of these 12 members is less than the average BMI of the other 38 club members in your sample.
b) In a sample of 12 bank tellers at a local branch office, the 7 tellers who have completed the advanced training program offered by the bank have a lower average error rate in the processing of transactions than the remaining 5 tellers.
If a blue ball is selected you win nothing. Let X be the amount that you win. The expected value of X and let the random variable X be a random number with the uniform density curve given below
Compute z values for each and comment on your findings.
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Compute the value of z and state your decision regarding the null hypothesis.
Use value you found in part a to find out degree of confidence for interval 65.65
Determine the most economical monthly shipping schedule. Provide a table showing the routes and total costs.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Provide a discussion that supports the assumption that the variance of savings increases with family income.
MATH1550H: Assignment: Question: Experience shows that X, the number of customers entering a post office during any period of time t, is a random variable the probability mass function of which is of the form
Interpreting confidence interval for the P-value. Give an appropriated response. A weight loss center provided a loss for 72% of its participants.
If the payoff from outcome A is twice the payoff from outcome B, then the ratio of these utilities will be.
There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 that are possible equals:
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