Recent content by Calculator14

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 Assume that the cholesterol level of college aged men nationwide is normally distributed with mean of 180 and standard deviation is 20. Twelve male MVCC students were randomly selected; the cholesterol level of each was determined: 250, 220, 145, 225, 170, 210, 200, 210...

Null Hypothesis/Alternative hypothesis, statistics help! Homework Statement For each of the following questions, state(using symbols) the null and alternative hypotheses. a.)Does the average speed of vehicles on the Thruway exceed 65? b.) Is the mean height of 6th graders different...

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 You look at a random sample of 64 vehicles in one school parking lot and find that 24 are trucks. Determine the 80% confidence interval for the true population proportion of trucks in all the school lots. Homework Equations (work shown below) The Attempt at a...

Homework Statement Glucose level is normally distributed, standard deviation is known to be 25 units; determine the sample size needed to be 95% confident that the sample mean and the true population mean differ by at most 4 units. Homework Equations (work shown below) The Attempt...

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 Assume that the population is normal with some unknown mean and standard deviation of 25. A sample size 400 is taken. The resultant sample mean is 67. a.) What is your best estimate for the value of the population mean? b.) What is the value of the standard error...

Probability Interval, statistics help! Homework Statement Assume that the population is normal with mean of 90 and standard deviation of 25. A sample of size 100 will be selected. a.) What is your best estimate for the value of the sample mean? b.) What is the value of the standard error...

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??

Hi tiny-tim! I'm sorry, I am lost on how to start this equation. Would you be able to guide me a bit through this? Thank you for your help!

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...