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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.
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
Decide whether experiment is binomial, Poisson or neither based on info given. Each week man plays game in which he has a 21% chance of winning.
In fitting the simple linear regression model Yi ~ N (α + β xi, σ 2 ) to the following data:
Complete the table and answer the following questions. Use the .05 significance level.
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
A recent study reported that the prevalence of hyperlipidemia (defined as total cholesterol over 200) is 30% in children 2-6 years of age. If 12 children are analyzed,
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
A population of scores has p = 44. In this population, an X value of 40 corresponds to z = - 0.50. What is the population standard deviation.
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Calculate the probability that the median of the sample or average medians is:
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
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