Question 1
A regression and correlation analysis resulted in the following information regarding an independent variable (x) and a dependent variable (y).
ΣX = 42
ΣY = 63
n = 7
Σ (Y - )(X - ) = 37
Σ (X - )2 = 84
Σ (Y - a. = 6.3571 + 0.4405xb.p-value < .05; reject Hoc.p-value < .05; reject Hod.0.582Question 2An automobile dealer wants to see if there is a relationship between monthly sales and the interest rate. A random sample of 4 months was taken. The results of the sample are presented below. The estimated least squares regression equation is = 75.061 - 6.254XYXMonthly SalesInterest Rate (In Percent)22 9.220 7.61010.445 5.3a.Obtain a measure of how well the estimated regression line fits the data.b.You want to test to see if there is a significant relationship between the interest rate and monthly sales at the 1% level of significance. State the null and alternative hypotheses.c.At 99% confidence, test the hypotheses.d.Construct a 99% confidence interval for the average monthly sales for all months with a 10% interest rate.e.Construct a 99% confidence interval for the monthly sales of one month with a 10% interest rate.
Question 2
An automobile dealer wants to see if there is a relationship between monthly sales and the interest rate. A random sample of 4 months was taken. The results of the sample are presented below. The estimated least squares regression equation is = 75.061 - 6.254X
Y
X
Monthly Sales
Interest Rate (In Percent)
22
9.2
20
7.6
10
10.4
45
5.3
Ask unlimited questions for free
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
For a complete list of videos, visit our video library
