a professor of economics has 2 graduate assistants helping him. the probability that the older of two assistants will be absent on any given day is 0.08, the younger one 0.05, the probability that...
a professor of economics has 2 graduate assistants helping him. the probability that the older of two assistants will be absent on any given day is 0.08, the younger one 0.05, the probability that...
There were 50 students in session 1 of a STA 13 class last year (the total # of students was 519). In the final exam, the average score in session 1 was 56.3 and the standard deviation was 13.8. Construct...
A random variable x has a normal distribution in the 50th percentile for x is 5. What is the mean of x?
Let z be a standard normal random variable. Find P(0.48 < z < 2.3 and z > 1.9). I tried to do them both separately and then putting them together but I ended up with the wrong...
A poll taken just prior today finds that 389 of 700 registered voters intend to vote for Jake Anderson for mayor. We want to test Ho: q=0.5 where q represents the proportion of all voters who intend...
A biology paper refers to a sample correlation of .8 as "not statistically different from 1." This strikes me as nonsense. The probability of such a result or one more extreme...
In a bag, there are 10 yellow marbles and 9 red marbles. If the probability of choosing a yellow marble is 1/10, how many orange marbles are there in the bag? Not sure how to figure...
True or false ? I believe it is true. An independent-measures research study compares three treatment conditions using a sample of n = 5 in each...
(3) No matter how close to zero the coefficient may be. SOMETIMES there is no significance to the correlation between the variables. OR (4) The more neg. the coefficient become, the linear...
assuming that the cars satisfy the Nearly Normal condition, find the speeds that boarder the middle 90% of the data
A team of software engineers are testing the time taken for a particular type of modern computer to execute a complicated algorithm for factoring large numbers. They would like to estimate the mean...
The lengths of turtles in a park are normally distributed with a mean of 21.6 inches and a standard deviation of 4.4 inches. What is the percentile rank of a turtle whose length is 17 inches?...
A one-sample z-test was used to test the following hypotheses: H0 : μ = 39 and H1 : μ ≠ 39. Select the pair of 95% and 99% confidence intervals (which were based on the z-test) that are consistent...
A computer game developer wants to test if a new game they have designed is better than a similar existing game. In particular they wish to test the hypotheses H0: μN = μO and H1: μN...
I have the following problem and can't figure it out. A mileage test is conducted for a new car model, the “Pizzazz.” Thirty random selected Pizzazzes are driven for a month and the...
Can't seem to get the right answer for these 5. Please help! thanks!!! The 50th percentile is ____ The 10th percentile is ____ The 90th percentile is ____ The 20th percentile...
You are testing the claim of “The Big Cookie” Company that it puts 20 chocolate chips in its big cookies. Many consumers have complained that they have been short changed. Test the claim from the...
I REALLY NEED HELP ON THESE! I DONT UNDERSTAND EACH ONE AT ALL! PLEASE TAKE ME TO THE PROCESS OF ANSWERING IT AND GIVE THE FINAL ANSWER! 1) Use two regular 6-sided dice and a...
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population means, but your statistical software provides only a one-tail area of 0.156...
A Z-score for a test value of 70% is 0, and a Z-score of 1.0 corresponds to a test score of 74%. Match the remaining Z-scores with the standard deviations