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A new chemical process is introduced by Duracell in the production of lithium-ion batteries. For batteries produced by the old process, the average life of a battery is 102.5 hours.
To determine whether the new process affects the average life of the batteries, the manufacturer collects a random sample of 25 batteries produced by the new process and uses them until they run out.
The sample mean life is found to be 107 hours, and the sample standard deviation is found to be 10 hours. Are these results significant at the α = 0.05 level? Are they significant at the α = 0.01 level? Explain. Draw your conclusion.
Therefore, if you are using a 10% level of significance that the average price-earnings ratio has decreased from the past, what is your conclusion concerning the null hypothesis?
Final model for the clothing retailer problem. The residual plots below show the residuals for the final model in the clothing retailer problem plotted against Purchase12 and Recency. Do the plots suggest any potential problems with the conditions..
cars arrive at a toll booth at eppley airfield in omaha at an average rate of 8 in 20 minutes. arrivals are poisson
A company's records indicate that on any given day, 1% of their day shift employees and 2% of the night shift employees will miss work. Sixty percent of the employees work the day shift. What percent of employees are absent on any given day?
At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations? State your null and alternative hypotheses. (Note: while the small sample size could justify use of the non- parametric Kruskal-W..
a researcher notes that the correlation in the group she studies is so large that if there were not a correlation among
short term versus long runshort-term aberrations do not affect the long run. to illustrate suppose that you flip a coin
1. Let the population be given by {1, 2, 3}. Let p(x) = 1/3 for x = 1, 2, 3. Take samples of size 3 with replacement. (a) Calculate μ and σ2. (b) Obtain the sampling distribution of the sample mean.
question 1.nbspa large scale marketing survey was conducted. some of the variables collected weregender nbsp
Illustrate that probability distribution of X satisfies properties of a discrete probability distribution.
How does the shape of the quantile plot affect your interpretation of the results?
An employer interviews 9 people for 6 computer programming positions in a company, and 4 of the 9 people are men. If all 9 are qualified, in how many ways can the employer fill the computer programming positions if exactly 3 are men?
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