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A statistical test problem (§3.6)
Using one die and rolling it 1,200 times, someone claims to have rolled the points 1, 2, 3, 4, 5, and 6 for a respective total of 196, 202, 199, 198, 202, and 203 times. Do you believe that these outcomes are, indeed, the result of coincidence or do you think they are fabricated?
what are the three most important things you learned about sampling? write 5 sentences
Three HIV treatments were tested for their effectiveness in preventing progression of HIV in children. Of 276 children given drug A, 259 lived and 17 died. Of 281 children given drug B, 274 lived and seven died.
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time?
A random sample of 30 potential buyers yields an average maximum price of $26,500 and standard deviation $3,800. Give a 95% highest-posterior density credible set for the average maximum price a consumer would pay.
Based on this information, how strong is the relationship between the vote on Nov. 7 and the change (from Nov. 7 to the certified totals)?
A random sample of 100 people in the United States reveals that their mean "amount to feel rich" is $2.3 million and the standard deviation is $0.5 million. Conduct the test.
For each correlation coefficient below, calculate what proportion of variance is shared by the two correlated variables:
two independent observations are selected randomly from a standard normal distribution. the probability that their
Is there evidence that a stock split causes excess returns for the month following the split? Redo the problem, using the sign test.
the mean gross annual incomes of certified welders are normally distributed with the mean of 20000 and a standard
You randomly select 10 college students and ask each to name the reason he or she uses credit cards.
Find the median income of all the orders. Calculate mean. median and mode from the following frequency distribution of marks at a test in English.
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