Astudy is done by a community group in two neighboring colleges to determine which one graduates students with more math classes. college a samples 11 graduates. their average is 4 math classes with a standard deviation of 1.5 math classes. college b samples 9 graduates. their average is 3.5 math classes with a standard deviation of 1 math class. the community group believes that a student who graduates from college a has taken more math classes, on the average. both populations have a normal distribution. test at a 1% significance level. answer the following questions. a. is this a test of two means or two proportions? are the populations dependent or independent? b. are the populations' standard deviations known or not? c. which distribution is to be used? d. what is random variable? e. hypothesis? f. test is two tailed or one tail? g. test value h. use p-value method) to reach to the conclusion?

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it