has failed with a probability of 0.30. What is the probability that fewer than 25 batteries will last at least 8 hours? A.0.8967 B.0.9991 C.0.0009 (CORRECT) D.0.0024 Question 7 of 25 1.0/ 1.0 Points The standard normal distribution has a mean of ___ and standard deviation of ___‚ respectively. A.1 and 0 B.0 and 0 C.0 and 1 (CORRECT) D.1 and 1 Question 8
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the starting point for your selection. ©Are the invoices selected in (a) the same as those selected in(b)?why or why not? 7.21. The diameter of a brand of ping-pong ball is approximately normally distributed‚ with a mean of 1.30 inches and a standard deviation of 0.04 inch. If you select a random sample of 16 ping-pong balls‚ (a) What is the sampling distribution of the mean? (b) What is the probability that the sample mean is less than 1.28 inches? ©what is the probability that the sample mean is
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Experiment # 1 Date: 18/12/13 Title: Chemical Properties of Alkanes. Aim: To test the reactivity of alkanes using cyclohexane as an example. Apparatus/Materials: Cyclohexane‚ liquid alkane‚ aqueous bromine‚ test tubes‚ light source‚ watch glass‚ splint‚ 0.1 MKMnO4‚ concentrated H2SO4‚ dilute H2SO4. Method: Combustion: 1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on. 2. 4 drops of cyclohexane was placed on the watch glass using
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= 3 0.95 σ = 1 0.95 X 19 25 31 -2 0 +2 Normal curve showing Standard normal curve showing area between 19 and 31 area between -2 and +2 Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that he must score better than at least 70% of the students who
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HMC’s portfolio 2. Why is HMC focusing on real returns? 3. HMC’s estimates of expected returns‚ standard deviations and correlations di_er from the twenty-year historical estimates. Why might this be? Comment on the di_er- ence between the two sets of estimates‚ focusing on expected returns and standard deviations. 4. Let’s assume from now on that HMC’s estimates of expected returns‚ standard devia- tions and correlations are given in Exhibit 4. Looking at Exhibit 4‚ comment on the signs
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reduce this by half as well as taking mean and standard deviation of each style into account. Obviously‚ to produce half of the forecast‚ it has to produce at lower than the “mean” (Average Forecast) of each style. By taking standard deviation into account‚ this can be calculated using the formula “Mean – K*Standard deviation” . Note that the standard deviation in this formula is “2*standard deviation” in the Exhibit 10 as Wally found that the standard
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Gender | Mean | Standard Deviation | Qualitative Description | Male | 3.21 | 0.58 | fair | Female | 2.94 | 0.59 | fair | Overall | 3.04 | -0.60 | Fair | Table 3 summarizes the academic Perception of Third Year High School Students on Disruptive Behaviour according to gender. The data shows that the mean of male students is 3.21with a standard deviation of 0.58 which is interpreted as fair. Moreover‚ the female students obtained a mean of 2.94 with a standard deviation of 0.59 that can
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process. Their client has offered samples to be analyzed‚ so they can quickly learn whether the process is operating satisfactorily or corrective actions needs to be taken. The numbers given in the case were as follows: assumed population standard deviation is equal to .21‚ sample size is equal to 30 and the test value of the mean was 12. They also stated the two hypotheses to be tested: the null hypothesis that the population is equal to 12 and the alternative hypothesis that the mean is not
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Statistics Project MATH 2014 Prepared for: Sylvester Phagoo Prepared by: Denille Layne # 55937 Coursework Title: To determine if sleep or a lack of sleep can cause obesity among University students Introduction: The question in front of physicians now is “can sleep or the lack of sleep cause obesity?” recent research findings say yes‚ but is it true? They say that a lack of sleep makes you gain fat. Sleeping less can cause changes in complex metabolic pathways that control your
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Process Improvement Plan University of Phoenix Dr. Anthony Matias March 24‚ 2011 Abstract The premise of this paper is to identify deficiencies in daily managerial processes by using systematic statistical process controls and make the necessary improvements. The paper will employ various examples and calculations along with supporting data to explain control limits and its importance to the statistical process control. The effects of seasonal factors and its relevance to a process
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