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Q1) Manager at a light bulb factory wishes to find out whether there is any difference in mean life expectancy of bulbs manufactured on two different kinds of machines. Population standard deviation of machine I is 100 hours and of machine II is 115 hours. Random sample of 30 light bulbs from machine I points out a sample mean of 375 hours, and similar sample of 30 from machine II points to sample mean of 362 hours. At 5% level of significance, is there evidence of difference in mean life of bulbs made by the 2 kinds of machines. What is your conclusion?
compute the expected value and variance of U.Determine Expected value and variance using uniform distribution.
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
How do we decide if the homogeneity of variance assumption is significantly violated?
Estimating a linear regression equation to predict the future values of the dependent variable Y.
We want to test the hypothesis that population B has a smaller variance than population A.
Number of miles flown in a One- year period by the sample of "frequent flyers" was recorded. Is this a grouped or an ungrouped frequency distribution?
Draw a simulation experiment for car agency and simulate using fleet of four rental cars for 10 days.
Formulate the null and alternative hypotheses for this application.
The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the mea..
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots. A partial ANOVA table
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