Mathematics, 13.12.2019 23:31 lopezsharon333
An examination of the records for a random sample of 16 motor vehicles in a large fleet resulted in the sample mean operating cost of 26.31 cents per mile and the sample standard deviation of 2.80 cents per mile. (assume that operating costs are approximately normally distributed.) keep at least 4 significant digits in your answer.
1.construct a 95% confidence interval for the mean operating cost.2.construct a 90% confidence interval for the variance of the operating costs.3.the manager wants to believe that the actual mean operating cost is at most 25 cents per mile. perform the appropriate test at a 5% level of significance. what is the value of your test statistic? what is the critical value? accept or reject null hypothesis? 4. test whether the overall standard deviation of the operating costs is more than 2.30 cents per mile or not at a 5% significance level. what is the value of your test statistic? what is the critical value at a 5% significance level? accept or reject null hypothesis?
Answers: 2
Mathematics, 21.06.2019 13:00
In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?
Answers: 3
Mathematics, 21.06.2019 20:00
Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.
Answers: 1
Mathematics, 21.06.2019 22:30
Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.
Answers: 1
An examination of the records for a random sample of 16 motor vehicles in a large fleet resulted in...
Biology, 20.02.2020 03:27
Social Studies, 20.02.2020 03:27
Mathematics, 20.02.2020 03:27
English, 20.02.2020 03:27
English, 20.02.2020 03:27