Stats Final guide
STATISTIC
(1) A study of the number of cars sold looked at the number of cars sold at 500
Dealers The smallest dealer had 11 cars sold and the largest had 154 cars sold. If you were going to create a frequency distribution of the number of cars sold using six classes in your frequency distribution, which of the following might be a reasonable first class?
(a) 0 to 25 _
(2) Give that a sample of 25 had x = 75, and (x-x)² = 48 the mean and standard deviation are _ (c) X = 3.0 and S = 48/24
(3) Which of the following is always true for a test of a hypothesis?
(a) The type ll error is more important than type l error (b) is larger then
(c ) is the probability of a type ll error (d) A type l error occurs when you accept the null hypothesis when it is not true (e) None of the above is true.
(4) Suppose that, in attesting situation with a population that is normally distributed,
The null hypothesis is that the population mean is equal to 41. A sample of size 36 had a sample mean of 41 and sample standard deviation of 2. Which of the following is correct? (b) You cannot reject the null hypothesis
(5) If you take a sample of size 24 from a normal population for which you do not know the population standard deviation and want to calculate a 95% confidence interval for the mean, which is not need? (c) The value of Z0.025
(6) The coefficient of determination, R²
(b) Tell us how close the Regression line fits the points in a scatter diagram.
(7) The expected value of a random variable is also-- E(X) (c) A weighted average
(8) The retail price of a product is $5 per unit & the cost of production is $2 per unit. If the
(1) A study of the number of cars sold looked at the number of cars sold at 500
Dealers The smallest dealer had 11 cars sold and the largest had 154 cars sold. If you were going to create a frequency distribution of the number of cars sold using six classes in your frequency distribution, which of the following might be a reasonable first class?
(a) 0 to 25 _
(2) Give that a sample of 25 had x = 75, and (x-x)² = 48 the mean and standard deviation are _ (c) X = 3.0 and S = 48/24
(3) Which of the following is always true for a test of a hypothesis?
(a) The type ll error is more important than type l error (b) is larger then
(c ) is the probability of a type ll error (d) A type l error occurs when you accept the null hypothesis when it is not true (e) None of the above is true.
(4) Suppose that, in attesting situation with a population that is normally distributed,
The null hypothesis is that the population mean is equal to 41. A sample of size 36 had a sample mean of 41 and sample standard deviation of 2. Which of the following is correct? (b) You cannot reject the null hypothesis
(5) If you take a sample of size 24 from a normal population for which you do not know the population standard deviation and want to calculate a 95% confidence interval for the mean, which is not need? (c) The value of Z0.025
(6) The coefficient of determination, R²
(b) Tell us how close the Regression line fits the points in a scatter diagram.
(7) The expected value of a random variable is also-- E(X) (c) A weighted average
(8) The retail price of a product is $5 per unit & the cost of production is $2 per unit. If the