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Q1) To evaluate average annual expenses of students on books and class materials sample size 36 is taken. Average is $850 and standard deviation is $54. A 99% confidence interval for he population mean is:
a) $823.72 to $876.28
b) $832.36 to $867.64
c) $826.82 to $873.18
d) $825 to $874.52
Q2) Random sample of 16 ATM transactions at Last National Bank of Flatrock revealed a mean transaction time of 2.8 minutes with standard deviation of 1.2 minutes. Width (in minutes) of 95% confidence interval for true transaction time is:
a) +or-0.639
b) +or-0.588
c) +or-0.300
d) +or-2.131
Q3) Study of effectiveness of two sea sickness prevention medicines of people who would normally experience sickness had following results in rough seas on a 3 hour cruise about SS Minniw:
Product A: 145 people out of 210 felt no sea sickness symptoms
Product B:135 people out of 180 felt no sea sickness symptoms
Test claim that there is no difference between effectiveness of product A and B using significance level of 0.1 Create distribution curve and show values
Ho : ................... P-value=....................
H? :......................... Test stat =.................
CV=.................(critical value)
Obtain a test statistic and p-value. Interpret the results at = .01.
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
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What percentage of items will weigh between 6.4 and 8.9 ounces?
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
Find the probability of getting a head and rolling a six
Illustrate what decision should be made depended on the mini-max regret criterion. Decision based on the Mini-max criterion.
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
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
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