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A new cell phone battery is being considered as a replacement for the current one. Ten college student cell phone users are selected to try each battery in their usual mix of "talk" and "standby" and to record the number of hours until recharge was needed.
(a) Do these results show that the new battery has significantly longer life at α = .05? State your hypotheses and show all stepsclearly.
(b) Is the decision close?
(c) Are you convinced?
Bob May Deno Sri Pat Alexis Scott Aretha Jen Ben
New battery 45 41 53 40 43 43 49 39 41 43
Old battery 52 34 40 38 38 44 34 45 28 33
A business owner decides to use a binomial distribution to solve one of his problems.
If Z = 1.96, s = 3, and E = 1, determine the correct sample size.
It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is within 2 standard deviations of mean.
Find out the p-value associated with test of hypothesis you conducted?
A ski company in Vail owns two ski shops, one on the east side and one on the west side. Sales data showed that at the eastern location there were 56 pairs of large gloves sold out of 304 total pairs sold.
The State of Ohio plays a daily (except Sunday) three digit lottery, where the player chooses any three numbers, 1 thru 10, three different times.
If there are repeated independent trials and there are only two outcomes, what distribution should be used?
Let's treat race of offenders as the independent variable and race of victims as the dependent variable. If we first ignore the independent variable and try to predict race of victim, how many errors will we make?
Flaws occur in the interior of plastic used for automobiles according to a Poisson distribution with a mean of 0.02 flaws per panel. If 50 panels are inspected, what is the probability that the number of panels that have one or more flaws is less ..
Joan's nursery specializes in custom-designed landscaping for residential areas. the estimated labour cost associated with a particular landscaping proposal is based on the number of plantings of trees,shrubs and so on to be used for the project.
Do you think that these types of statistics can ever be accurate? How could this statistic be biased? In what ways could scientists misinterpret the results of their studies and come up with an incorrect statistic? What are your thoughts?
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
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