Statistics and Probability Answers

If the following information test for the significant difference between the
two means of the samples
Particulars Sample 1 Sample 2
Mean 20.86 18.94
S.D 2.98 2.66
Size 10 8

Listed below are pulse rates​ (beats per​ minute) from samples of adult males and females. Does there appear to be a​ difference? Find the coefficient of variation for each of the two​ samples; then compare the variation.
Male 88,69,63,71,71,52,65,54,83,70,64,63,99,56,65
Female 67,84,82,70,76,85,86,85,87,88,94,72,86,79,80

A sample of blood pressure measurements is taken for a group of​ adults, and those values​ (mm Hg) are listed below. The values are matched so that 10 subjects each have a systolic and diastolic measurement. Find the coefficient of variation for each of the two​ samples; then compare the variation.
Systolic 119,128,157,94,157,121,118,136,125,122
Diastolic 79,76,75,54,89,88,60,65,73,83
The coefficient of variation for the systolic measurements is %

Listed below are foot lengths in inches for 11 randomly selected people taken in 1988. Find the​ range, variance, and standard deviation for the given sample data. Include appropriate units in the results. Are the statistics representative of the current population of all​ people?
8.6,9.2,8.8,9.3,8.5,9.9,10.2,8.910.2,10.5,9.7
The range of the sample data is

Find the​ range, variance, and standard deviation for the given sample data. Include appropriate units in the results.
Listed below are the measured radiation absorption rates​ (in W/kg) corresponding to various cell phone models. If one of each model is measured for radiation and the results are used to find the measures of​ variation, are the results typical of the population of cell phones that are in​ use?
0.74,0.72,1.38,0.67,1.09,0.76,1.08,0.96,0.74,0.98,0.87

Listed below are the numbers of hurricanes that occurred in each year in a certain region. The data are listed in order by year. Find the​ range, variance, and standard deviation for the given sample data. Include appropriate units in the results. What important feature of the data is not revealed by any of the measures of​ variation?16,1,12,1,20,3,5,18,19,7,18,12,4,20
The range of the sample data is

The body temperatures of a group of healthy adults have a​ bell-shaped distribution with a mean of 98.11F and a standard deviation of 0.56F. Using the empirical​ rule, find each approximate percentage below.
a.What is the approximate percentage of healthy adults with body temperatures within standard of the​ mean, or between 97.55F and 98.67F?
b.What is the approximate percentage of healthy adults with body temperatures between 96.43F and ​99.79F?
Approximately ? ​% of healthy adults in this group have body temperatures within 1 standard of the​ mean, or between 97.55F and 98.67F.

In a certain​ country, the true probability of a baby being a girl is 0.473 . Among the next four randomly selected births in the​ country, what is the probability that at least one of them is a ​boy?
The probability is