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A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 67.8 inches and a standard deviation of 4.0 inches. A study participant is randomly selected.
(a) Find the probability that his height is less than 65 inches.
(b) The probability that the participant selected at random is between 65 and 71 inches.
(c) Find the probability that his height is greater than 71 inches.
A gambler loses 10 times running at roulette. He decides to continue playing because he is due for a win, by the law of averages. A bystander advises him to quit, on the ground that his luck is cold. Who is right? Or are both of them wrong?
Fitting of simple linear equation - Prepare an equation showing how daily sales are related to number of customers per day.
An experiment consists of making 80 telephone calls in order to sell a particular insurance policy.
Determine the p-value; and at 95% confidence, test the above hypotheses.
At a college, 70 percent of the students are women and 35 percent of students receive grade of C. About 20 percent of students are neither female nor C students. Use this contingency table.
Below are scores for 10 randomly selected students on each exam. 95% confidence interval for the mean scores on?
It does not matter, when data are skewed mean and median are the same.
Probability that the entire batch will be rejected?
Give an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Determine x-bar and s for this data set. You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.
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