Tested random sample of 158 cell phone batteries. Mean lifetime was 2.7 hours standard deviation of 0.2. Lifetimes apprx. Bellshaped. Estimated number of batteries with lifetimes between 2.5 hours...

Tested random sample of 158 cell phone batteries. Mean lifetime was 2.7 hours standard deviation of 0.2. Lifetimes apprx. Bellshaped. Estimated number of batteries with lifetimes between 2.5 hours...

Statistics thank you please

A data set had a median of 66, and four of the numbers in the data set are less than the median. The data set contains a total of n numbers. If n is even and none of the numbers are equal to 66, what...

Hey guys, having some issues with these 2 questions in chapter 22 and 23 of my book. My professor doesn't reply to me, so if anyone can help give me an idea I'd really appreciate it! 1) Use...

Please help!

What is the area under the normal curve between the mean and a piece of data with a z-score of -1.24?

What is the area?

what is the percentage?

Let X ∼ P(λ). We want to test the null hypothesis that λ = 15, and the alternative hypothesis is that λ > 15. Our sample size for this test is equal to 1. (a) We will reject...

A random sample of 80 graduate students shows that 22 students have shopped online in the past year. Is there enough evidence to show that the true population proportion is lower than 60%? Conduct...

What percentage of people have a travel time that is less than 10 minutes? 94.06% 11.88% 5.94% 56.97

In a random sample of 50 high school seniors, 9 had their own cars. In a sample of 75 university freshman, 20 had their own cars. At = .06 level of significance, test the claim that the proportion...

A food safety guideline is that the mercury in fish should be below 1 part per million (ppm). Listed below are the amounts of mercury (ppm) found in tuna sushi sampled at different stores in a major...

Round answer to four decimal places if necessary

Number 1 A 95% confidence interval for the mean difference of the number days per month those who commute to work in a major city and take a bus and those who commute to work in a major city and...

Finding sample size without a population size

Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.005; confidence level: 99%; from a prior study, is estimated by 0...

Question os related to randomized control trials topic in statistics

A. Find the value of t for the t distribution for the following. Area in the right tail =0.05 and df=17. Round your answer to 3 decimal places...

Use 2 decimal places. Max 2X + 3Y s.t. 4X + 9Y ≤ 72 10X + 11Y ≤ 110 17X + 9Y ≤ 153 X, Y ≥ 0 I need both the optimal solution and the objective value