Probability of event after x hours is 0.74e-0.5x + 0.25e-0.25x Find mean, variance and quartiles of waiting times
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Find mean, variance and quartiles of waiting times
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- H0 : =150.00 kPa H1 :>150.00 kPa b) α= 0.01; sample variance : 1300 (freq. table ) sample deviation : 36.0555 (freq. table ) Calculation of Data Mean of the results= = 6700/50 =134 Mid Range of the results= (217.32+46.32)/2= 131.82 Range = (217.32-46.32) = 171 Modal Class= Class 121-145 with the highest frequency of 15 Median of the sorted set of data = 132.25 Mode = there are not clear modes In the samples. Sample variance S o= 1300 Sample deviation: S =36.55Growth of bacteria culture after one week, represented by its size, is known to follow lognormal distribution with mean of 2 and variance of 0.2. What is the upper and lower quartile of the size of the culture after one week?Pearson correlation statistic is only valid when the relationship between the two quantitative (continuous) variables is
- Statistical Physicsplease help! rate will be given. write the complete solutions and legibly. APPLIED STATISTICS AND PROBABILITY FOR ENGINEERS > CORRELATION In an article in IEEE Transactions on Instrumentation and Measurement (2001, Vol. 50, pp. 986–990), researchers reported on a study of the effects of reducing current draw in a magnetic core by electronic means. They measured the current in a magnetic winding with and without the electronics in a paired experiment. Data for the case without electronics are provided inthe following table. See the attached photo Answer the following: a. Graph the data and fit a regression line to predict current without electronics to supply voltage. Is there a significant regression at α = 0.05? What is the P-value?b. Estimate the correlation coefficient.c. Test the hypothesis that ρ = 0 against the alternative ρ ≠ 0 with α = 0.05. What is the P-value?d. Compute a 95% confidence interval for the correlation coefficient.Kurtosis describes the peakness of the curve on the median mean mode
- The number of days (X) after mailout it takes a utility company to receive payment for a customer's bill is a normal random variable with a mean of 31 days and a standard deviation of 6 days. About 16% of bills will be received earlier than days after mailout.A special bumper was installed on selected vehicles in a large fleet. The dollar cost of body repairs was recorded for all vehicles that were involved in accidents over a 1-year period. Those with the special bumper are the test group and the other vehicles are the control group, shown below. Each "repair incident" is defined as an invoice (which might include more than one separate type of damage). Statistic Test Group Control Group Mean Damage x¯1x¯1 = $ 1,101 x¯2x¯2 = $ 1,766 Sample Standard Deviation s1 = $ 696 s2 = $ 838 Repair Incidents n1 = 12 n2 = 9 (a) Construct a 90 percent confidence interval for the true difference of the means assuming equal variances. (Round answers to 3 decimal places. Negative values should be indicated by a minus sign.) (b) Repeat part (a), using the assumption of unequal variances with Welch's formula for d.f. (Round answers to 2 decimal places. Negative values should be indicated by a minus sign.) (d) Construct separate…Determine the degree of freedom, right tailed area, t value Percentile - 95thn - 29df - (7)Right Tailed area - (8)t - (9)
- The results obtained from statistics analysis between the pulse rate at baseline and the pulse rate after smoking using t-test is 0.001, what should be the decision? reject the null hypothesis do not reject the null hypothesis restate the null hypothesis no decisionReading Pressure [mmH20] 397 1 2 398 397 7) Pressure values measured by various probes in the test section of a wind tunnel to obtain the freestream velocity have been given in the table below. The researcher who made the measurements concluded that the 8th reading 4 398 397 396 had a value of -3.625 as the "deviation from the mean" and eliminated the data 7 395 point based on the Chauvenet criterion. However, she later realized that she used the factor "1/n" instead of "1/(n-1)" in the calculation of standard deviation, which was used for data sets with a total number of data points less than 20. Find the value of the 8th reading and determine if the elimination is actually necessary. 8. ? 9 398 10 398 11 399 12 398 13 399 14 396 15 399 16 400