​Consider the following hypothesis problem. n = 30
H₀: σ² = 500
S² = 625
H_a: σ² ≠ 500
​
​The null hypothesis is to be tested at the 5% level of significance.The critical value(s) from the chi-square distribution table is(are)

A) ​42.557.
B) ​43.773.
C) ​16.047 and 45.722.
D) ​16.791 and 46.979.

Donnelly Excavating has received two offers on a used backhoe that Donnelly is advertising for sale. Offer 1 is for $10,000 down, $15,000 in six months, and $15,000 in 18 months. Offer 2 is for $8,000 down plus two $17,500 payments one and two years from now. What is the economic value of each offer today if money is worth 4.25% compounded semi-annually? Which offer should be accepted?

Mrs. Vandenberg has just deposited $5,000 in each of three savings plans for her grandchildren. They will have access to the accumulated funds on their 19^th birthdays. Their current ages are 12 years, 7 months (Donna); 10 years, 3 months (Tim); and 7 years, 11 months (Gary). If the plans earn 8% compounded monthly, what amount will each grandchild receive at age 19?

If you have a distribution of 20 scores,and you want 2 intervals,what should be the size of your class interval?

A) 10
B) 25
C) 50
D) 5

In a goodness-of-fit test,all of the proportions specified in the null hypothesis must be equal to each other.

You use a(n)____________________ interval whenever you want to estimate a one-time occurrence for a particular value of y when x is a given value.

A binomial distribution models several independent replications of a ________.

A) probability density function
B) Bernoulli experiment
C) continuous distribution
D) Poisson experiment