Statistics and Probability Answers

3. After running about 17 miles, marathon runners encounter a form of physiological stress which they call “hitting the wall.” To better pinpoint where in a race to expect this phenomenon, a sports physiologist has 12 male marathon runners race until each feels this stress. The variable of interest is the number of miles run until the stress occurs. These are
15.8 16.5 15.3 16.2 17.1 16.4
17.5 17.3 16.9 16.6 17.0 17.7
Construct the 95% confidence interval from the data.

2. Suppose that 100 people are sampled at random and their average web browsing time per week is 3.2 hours with a standard deviation of 2.5 hours. Construct the 99% confidence interval for the population mean.

1. Find the 95 per cent confidence interval for the mean age of the population from which the Resident sample was drawn ( = 46.06; s = 17.97).

"The effect of teachers motivation on students academic performance in private and governmental school, in the case of 2 private and 2 government school in Gullele sub- city.

What is the value of the correlation coefficient for operating cost per hour and number of
passenger seats in the plane? Interpret this correlation

http://apstatsmonkey.com/StatsMonkey/FRAPPYs_files/Frappy3.pdf

The AAA market research company has a list of all prersons who have flown southwest airlines in the last yr. To sample these persons about their flying experience, AAAMRC decides to separate the population into 4 groups: 1) frequent (4or more trips)businesess travelers 2)infrequent(3or fewer trips) business travelers30frequent leisure travelers: and 4) infrequent leisure travelers and then randomly sample from each group AAAMRC is doing a
Simple random sample
Stratified random sample
Systematic random sample
Cluster random sample

What is the probability of the same 2 individuals finishing 1st and 2nd in 2 consecutive contests that have 100 particpants each? To be more precise, individual 'A' finishes 1st in contest 1 and contest 2 while individual 'B' finishes 2nd in both contest 1 and contest 2. I calculate the probability as: 1/100 x 1/99 x 1/100 x 1/99. Is this correct?

in th preliminary test of gender-selected method 24 babies were born and 21 of them were boys. A. Find the number of different possible sequences of genders that are possible when 24 babies are born. B. How many ways can 21 boys and 3 girls be arranged in a sequence? C. If 24 babies are randomly selected shat is the probability that they consist of 21 boys and 3 girls? D. Does the gender-selection method appear to yeild a result

What is the confidence interval for the population mean assuming the population has a normal distribution and n=12, x=29.5, s=4.1, and 99% confidence

A random sample of 84 light bulbs had a mean life of 423 hrs with a standard deviation of 27hrs. Construct a 90% confidence interval for the mean life of all light bulbs of this type.