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Edward and his friends cannot go outside when it is sunny because they are vampires. Edward's hometown, Forks, Washington is usually very cloudy and rainy, but lately it has been very sunny with an 80% chance that it will be sunny each day for the foreseeable future. Assume that the weather is independent from day to day. Let S denote the number of days until Edward can go outside.
a) What are the distribution and parameters of S?
b) How many days should Edward expect to wait before he can go outside?
c) What is the probability that it is 8 days until Edward can go outside?
d) What is the probability that it takes between 8 and 10 days (inclusive) to go outside?
e) Given that he has already waited through 8 sunny days, what is the probability that his waiting time altogether is between 10 and 12 days (inclusive) to go outside?
A normal distribution with mean value 110 and standard deviation 15. Approximate the probabilities below. (Round all answers to four decimal places.)
If a student scored 90 points on a test where the mean score was 82.2 and the standard deviation was 5.7. What steps do I do to find out the student's z score?
A random sample of 51 observations was selected from a normally distributed population. The sample mean was = 88.6, and the sample variance was s2 = 38.2.
What assumption tests should be used? A fifth grade science teacher want to know if there is a relationship between final exam scores and overall course points after adjusting for a quiz score.
Using the .05 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing.
Certain tubes manufactured by a company have a mean life of 800 hours and standard deviation of 60 hours. Find the probability that a random sample of 16 tubes taken from the group will have a mean life of?
You calculate that their mean monthly rent is $613 and their standard deviation is $96. What are the degrees of freedom for a one-sample -statistic?
What statistic would be applied if the independant variable is nominal and one dependant variable is nominal and one dependant variable is scale? Is this a T-test?
Identify the sample mean of the paired differences between the two series of returns - Identify the standard error of the sample mean of the paired differences between the two series of returns.
suppose as part of a national study of economic competitiveness a marketing research firm randomly sampled 200 adults
the weight of an organ in adult males has a bell-shaped distribution with a mean of 330grams and a standard deviation
What is the probability of randomly selecting 10 production employees on a hot summer day and finding that none of them are absent?
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