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COMPARISON OF SPECIALTY AUXILIARY BACKUP LAB BATTERY LIFETIMES
A company that manufactures specialty batteries used as auxiliary back- ups for sensitive laboratory equipments in need of constant power sup- plies claims that its new prototype, brand A, has a longer lifetime (un- der constant use) than the industry-leading brand B, and at the same cost. Using accepted industry protocol, a series of tests carried out in an independent laboratory produced the following results: For brand A: sample size, n1 = 40; average lifetime, x¯1 = 647 hrs; with a population standard deviation given as σ1 = 27 hrs. The corresponding results for brand B are n2 = 40; x¯2 = 638; σ2 = 31. Determine, at the 5% level, if there is a signi?cant di?erence between the observed mean lifetimes.
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
What is the probability of randomly selecting a person who is conservative and then selecting from that group someone who is a nursing major?
The number of standard errors that the sample estimate (p 1 - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
Set up the null and alternative hypotheses for testing these claims. In order to conduct the test, the customer selected a significance level of alpha=.05. Interpret this value. (I.e. what does it mean to conduct the test at a level of alpha=.05)
consider the following results for independent samples taken from two populations.sample 1 n1400 p10.48sample 2 n2300
What is/are the advantage(s) of conducting a study with three or more levels of independent variables?
Given that the landowner pays for the soundings test and the test indicates that gas is present, what is the landowner's revised estimate of the probability of finding gas in this site?
Data file XR16056 lists the following information for a sample of local homes sold recently: selling price (dol- lars), lot size (acres), living area (square feet), and whether the home is air conditioned (1 5 AyC, 0 5 no AyC).
State the alternative hypothesis in statistical terms. Define the critical region by drawing the distribution and labeling the z-critical value.
Assume a sample of 400 American adults were taken. Show the sampling distribution of the proportion of adults who balance their checkbook at least once a month.
the revenues of the top eleven personal computer manufacturers are given in hundred millions15 17 23 26 27 35 72 88 91
What is the value of the sample mean resonance frequency? The confidence level for one of these intervals is 90% and for the other it is 99%. Which is which, and how can you tell?
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