CHEM101L Lab Exam 2

RDB Company produced four types of tires recently, Tires A, B, C, and D. Before this year ends, RDB would like to identify which type of tire will give the least amount of tire wear after 30,000 miles. The response variable is the difference in maximum tread thickness on a tire between the time it is mounted on the wheel of the car and after it has completed 30,000 miles. Four types of tires will be used to get an estimate of experiment error. In order to conduct this study, four cars, a BMW, a Ferrari, a Lamborghini, and a Mercedes Benz were selected to accommodate the 16 tires. The results for this design are given in the following table. Which tires of cars are significantly different? Use tukeys with hsd for your post hoc test.

he mean time taken to submit an assignment by a student was 20 days according to the previous semester record. he Exam office claimed that this year the submission time increased due to the natural calamities. Was the ubmission time really increased or not. Test the hypothesis with a 5% level of significance. The time taken by 15

Describe the data that are collected for a repeated measures t-test and the hypotheses that the test evaluates.

Obtained vaule from community is -1.49 and the critical vaule of the state is 1.96. Compare the obtained vaule to the critical vaule to see if the average number of cases in the community is different from that of the state.