a. Describe in words what features most of the frequency distributions of actual survival times have in common, based on the box plots for each group. b. Describe the differences in shape of actual survival time distributions between those for 1 to 5 months predicted survival times and those for 6 to 24 months. c. Describe the trend in median actual survival time with increasing predicted number. d. The predicted survival times of terminally ill cancer patients tend to

Let the joint PDF of two RV x, y be: A, for-2≤a≤2, 0≤b≤1, fx,y (a, b) = {0, otherwise. Derive the value of constant A and calculate the probability of x and y being in the interval 0≤x≤1, 0≤ y ≤<1, respectively.

Answer the following questions using the separate rates X1,..., X20 and Y1,..., Y20 shown in Figure 1. (a) Carry out the calculations for a test of the hypotheses that the mean U.S. mortality rate On remained the same or increased from 2005 to 2015 against the alternative that the mean mortality rate decreased. State the hypotheses, test statistic, rejection region, and p-value. Do not interpret the conclusion of the test. (b) Compute a 99% confidence interval for the change in mean heart rate mortality. Do not interpret the interval.

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8.Suppose you compare the mean of raw data and the mean of the same raw data grouped into a frequency distribution. These two means will be a. Exactly equal. b. The same as the median. c. The same as the geometric mean. d. Approximately equal.

What was the age distribution of nurses in Great Britain at the time of Florence Nightingale? Suppose we have the following information. Note: In 1851 there were 25,466 nurses in Great Britain. Age range (yr) 20-29 30-39 40-49 50-59 60-69 70-79 80+ Midpoint x 24.5 34.5 44.5 54.5 64.5 74.5 84.5 Percent of nurses 5.2% 9.5% 19.8% 29.1% 25.1% 9.4% 1.9% (a) Find the probability that a British nurse selected at random in 1851 would be 60 years of age or older. (Round your answer to three decimal places.)(b) Compute the expected age ? of a British nurse contemporary to Florence Nightingale. (Round your answer to two decimal places.) yr(c) Compute the standard deviation ? for ages of nurses shown in the distribution. (Round your answer to two decimal places.) yr

This is for my data analysis class. Please answer all parts of the question.

provide an interpretation of the the plots presented here. what do you learn about the data distribution? do any possible concerns emerge? Then, in two paragraphs, continue with an elaboration on the controlling idea, perhaps with an explanation, implication, or statement about significance.