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A health magazine recently reported a study in which researchers claimed that iron supplements increased memory and problem-solving abilities in a random sample of college women. All of the women took memory and problem-solving tests at the beginning of the study, then took iron supplements, and then took the same tests again at the end of the study. What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
What sample size and acceptable level would result in a probability of .05 that a good batch will be rejected and a probability of .10 that a bad batch will be accepted?
Which of the given experiments can be modelled by Poisson distribution?
To be 99% sure that we will not be late in completing the project, what is the requested completion time in work-days?
The time until a component is taken out of service is uniformly distributed on 0 to 8 hours. Two such independent components are put in series, and the whole system goes down when one of the components goes down.
The mean weight of loads of coal placed in train cars by a loading machine is 43.0 tons with a standard deviation of 8.0 tons. Assuming that the weight of loads placed in the train cars by this loader are normally distributed
Describe the types of decisions that do not involve uncertainty and risk and common approaches used for analyzying them.
Suppose four heads appeared face up on four tosses of a coin. what is the probability that a head will appear face up in the next toss of the coin?
How large sample should be selected in order to obtain p estimate with a bound of 0.08 on the error of estimation.
Suppose that the results of the sample lead to rejection of the null hypothesis. Classify that conclusion as a:
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
A pediatrician is interested in studying the effect of Motrin on reducing temperature in young children. Four children with influenza have their temperatures taken immediately before and then 20 minutes after taking a standard dose
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