Homework Statement
You wish to test whether or not a coin is fair, so you toss it 400 times and obtain 225 heads. Test the null hypothesis that the coin is fair and balanced against the alternative that it is not. Use the 5% significance level.
a.) Identify(using symbols) the null and...
Homework Statement
Suppose that the systolic blood pressure of 20 year old females is normally distributed with mean 120 and standard deviation 15.
a.) What proportion of 20 year old females will have readings between 115 and 125?
b.) If you selected a sample of 64 people from this...
Homework Statement
Assume the life expectancy of U.S. males is normally distributed with a mean of 80 years and a standard deviation of 5 years. What is the probability that a randomly selected male lives more than 86 years?
Homework Equations
(work shown below)
The Attempt at a...
Homework Statement
Records show that 72% of basketball foul shots attempted are successfully made during practice. Today, each of the 10 members of the team gets a practice shot. What is the probability that at least 8 team members make the shot successfully?
Homework Equations...
OHHHHHHHH! So I think I went a little too far with this, haha! My apologies tiny-tim, thank you for pointing out my mistake! I believe my answer should be .24??
Homework Statement
The probability that Joe owns a microwave oven is 75%; the probability that he owns a CD player is 45%; and the probability that he owns both is 40%. Find the probability that he owns either one but not both.
Homework Equations
(work posted below)
The Attempt at...
Homework Statement
Twelve colored ping-pong balls are placed into a shopping bag and well mixed. There are two red balls, six blue balls and four green balls. One ball is selected at random, its color noted and then it is set aside. A second ball is then randomly selected and its color...
Homework Statement
An appliance store purchases electric ranges from two companies. From company A, 600 ranges are purchased, and 5% are found to be defective. From company B, 300 ranges are purchased, and 8% are found to be defective. Given that a range is defective, find the probability...
Homework Statement
The number of defects in a sample of 20 parts is recorded for quality control purposes; over the last year the number of defects and their occurrence rate has been : 0 defects, 82%; 1 defect, 13%; 2 defects, 4%; 3 defects, 1%. Find the expected number of defects in the...
Homework Statement
The probability of Mr. Jones being selected for jury duty is 70%. The probability that Mr. Smith will be selected is 40%. The probability that neither will be selected is 10%. What is the probability that both are selected?
Homework Equations
the "and" rule
The...
Homework Statement
In a certain high-risk group, the chance of a person having suffered a heart attack is 70%. If four persons are chosen from the group, find the probability that at least one will have had a heart attack.
Homework Equations
(work shown below) these would be dependent...
T/F, Please Help! Elementary Statistics!
Homework Statement
5-If a true-false exam contains 10 questions, there are 20 different ways to answer all the questions.
Homework Equations
There are none for it is a true false question.
The Attempt at a Solution
I believe this is...
Homework Statement
4: (T/F) The expected value of a distribution always occurs at the center of the tallest bar on the histogram.
Homework Equations
(no equation necessary for it is T/F)
The Attempt at a Solution
I believe this is false for the expected value can be definite or...
Homework Statement
(T/F) Subjective probability based on intuition and experience has little use in the real world.
Homework Equations
(no equations needed for it is T/F)
The Attempt at a Solution
I believe this is False because subject probability is probability derived from...