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The Bottom Line Gift Boutique has been the target of many shoplifters in the past, but its newly installed camera security system has helped in the apprehension of 240 "sticky-fingered" customers in the last six months.
A breakdown of these 240 shoplifters revealed the following:Males =140, 80 were first time offenders and 60 were repeat offendersFemales=100, 60 were first time offenders and 40 were repeat offenders.
What is the probability that the shoplifter is a first time offender, given that the shoplifter is a male?
Can the formal hypothesis testing approach be used for nonparametric tests? How are parametric and nonparametric statistics different?
Ccompute a t-test comparing males' and females' heights. You must determine which type of t-test to compute. Write a short interpretation of the results.
We measure the self esteem scores of a sample of statistics students, reasoning that this course may lower their self esteem relative to that of the typical college student (µ=55 and σ x =11.35) We obtain these scores:
Working at Company X is very stressful for any human being. Medecines Sans Frontires stepped in to see if there is any possible violations of human rights at the notorious Company X.
A company that manufactures computer chips wants to use a multiple regression model to study the effect that 4 different variables have on y, the total daily production cost (in thousands of dollars).
Out of the 109 males, 42% preferred Pepsi and out of the 53 females, 40% preferred Pepsi. Pepsi wanted to test to determine if the males preferred Pepsi more than females.
Would he be justified in concluding that walking slowly may cause high cholesterol or that high cholesterol may influence walking speed? Explain why or why not.
In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from asthma. Find the P value for a test of the claim that the proportion of all children in the town who suffer from asthma is equal to 11%.
Compute the value of the test statistic (to 2 decimals).
The amount of a brand of soda in 12-ounces can is approx. normal with a mean of 12.1 ounces and a standard deviation of 0.15 ounces.
When 6 telephones are received, all of them are free of defects. What is the written description of the complement of the above event?
What is the p value? Describe the steps in formal hypothesis testing. Make at least one comment for each step.
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