Stats Help for College-level Students

Probability: application of school children with asthma

A research company stated that 20% of missed school days are due to asthma. If a group of 400 school children are selected at random, what is the probability that fewer than 70 will miss school because of asthma? a) 0.1056 b) 0.0947 c) 0.1170 d) 0.4049 e) None of the above

Multiple choice question about a normal distribution, standard deviation and mean.

If IQ scores on a Stanford-Binet Test are normally distributed with a mean of 100 and a standard deviation of 15, then about how many people in a randomly chosen million would be expected to score at 160 or above? (This was at one time the break off score for the "genius" designation.) a) 47 b) 32 c) 16 ...continues

Multiple choice question about the area under a normal distribution curve.

What is the area under the normal standard distribution curve to the left of z = 0.87? a) 0.3078 b) 0.8078 c) 0.1922 d) 0.6922 e) None of the above

Probability: school children with asthma

A research company stated that 20% of missed school days are due to asthma. If a group of 400 school children are selected at random, what is the probability that fewer than 70 will miss school because of asthma? a) 0.1056 b) 0.0947 c) 0.1170 d) 0.4049 e) None of the above

Working with probability in a coin toss.

If one flips a fair coin 5 times, what is the probability of not getting 5 tails?

Hypothesis testing

Hypothesis testing questions

Hypothesis Testing

Hypothesis Testing

Linear Regression

43. The National Association of Home Builders ranks the most and least affordable housing markets, based on the proportion of homes that a family earning the median income in that market could afford to buy. Data showing the median income ($1000s) and the median sale price ($1000s) for a sample of 12 housing markets th ...continues

Multiple regression

Recall that in Exercise 45 the personnel director for Electronics Associates developed the following estimated regression equation relating an employee's score on a job satisfaction test to length of service and wage rate. Y = 14.4 minus 8.69 x1 minus 13.5 x2 Where X1 = length of service in years X2 = wage ...continues

probabilities

1.Find the probabilities for the standard normal random variable z: P(-1.551.38 4. Assume the heights of men have a mean of 69 inches with a stan ...continues