If anyone could please help me with this project it would be greatly appreciated. there are two companies: company
#1 chatlong: 18 hours average and 2 hrs standard deviation company
#2 talk-a-lot: 20 hours average and 3 hrs standard deviation

1. Which company do you think makes the longest-lasting (and better) cell phone? Explain your thinking.

2.
a. Pick one of the two companies and sketch out a normal curve for it. Be sure to label it and use vertical lines to locate the mean and 1 standard deviation on either side of the mean.
b. What is the range of values for each company to be within 1 standard deviation?
c. What is the range for the 68-95-99.7 distribution?

4. Two students each buy one cell phone and perform their own experiments to wear out the batteries. Here are the data:

student 1 chatlong: 20 hours
student 2 talk-a-lot: 20 hours

a. Based on their sample data, which of the cell phones is better?
b. In order to properly compare the data, calculate the z-scores for each sample data point.
c. Use a statistical calculator or a standard normal chart to find the percentile for each z-score you found in part b above.
d. Now who do you think got the better cell phone (with longer battery life) and why?

5.
a. Is it problematic to decide that one company is better than another based solely on the students' sample data? Explain.
b. How would you improve the students’ experiment if you were going to conduct it yourself?

Im literally having a mental breakdown

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Listed below are time intervals (min) between eruptions of a geyser. assume that the "recent" times are within the past few years, the "past" times are from around 20 years ago, and that the two samples are independent simple random samples selected from normally distributed populations. do not assume that the population standard deviations are equal. does it appear that the mean time interval has changed? is the conclusion affected by whether the significance level is 0.10 or 0.01? recent 78 90 90 79 57 101 62 87 71 87 81 84 57 80 74 103 62 past 88 89 93 94 65 85 85 92 87 91 89 91 follow the steps of hypothesis testing, including identifying the alternative and null hypothesis, calculating the test statistic, finding the p-value, and making a conclusions about the null hypothesis and a final conclusion that addresses the original claim. use a significance level of 0.10. is the conclusion affected by whether the significance level is 0.10 or 0.01? answer choices below: a) yes, the conclusion is affected by the significance level because h0 is rejected when the significance level is 0.01 but is not rejected when the significance level is 0.10. b) no, the conclusion is not affected by the significance level because h0 is not rejected regardless of whether a significance level of 0.10 or 0.01 is used. c) yes, the conclusion is affected by the significance level because h0 is rejected when the significance level is 0.10 but is not rejected when the significance level is 0.01. d) no, the conclusion is not affected by the significance level because h0 is rejected regardless of whether a significance level of 0.10 or 0.01 is used.