Seven cards numbered 1 through 7 are placed facedown randomly on a table. Andy picks a card and does not return it to the table.
Th
picks another card.
What is the probability that the first card Andy picks is a 6 and the second card is a 7?
A.
B. Ž
O
O c. 23
D.
13
42
O
picks another card.
What is the probability that the first card Andy picks is a 6 and the second card is a 7?
A.
B. Ž
O
O c. 23
D.
13
42
O
2 answers:
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The regression equation of Y on X is given by the following formula:
Where byx is given by the formula:
Where N is the number of values (N=8). We need to find the sum of X values, the sum of Y values, the average of X, the average of Y, the sum of X*Y and the sum of X^2.
The table of values is:
The values we need to know are on the following table:
By replacing the known values in the formula we obtain:
Now, the average of X and Y is the sum divided by N, then:
Replace these values in the formula and find the regression equation as follows:
The answer is a) y=4.6x+28.26
Answer: ($3.532, $4.166)
Step-by-step explanation:
Given : Significance level :
Critical value :
Sample size : n= 157
Sample mean :
Standard deviation :
The confidence interval for population mean is given by :_
Hence, the 0% confidence interval for the average tip given at this restaurant = ($3.532, $4.166)