# statistics

posted by .

(a)Comparison of GPA for randomly chosen college juniors and seniors:
xbar= 3.05, s1 = .20, n1 = 15, xbar2= 3.25, s2 = .30, n2 = 15, รก = .025, left-tailed test.

calculate
d.f. ____________
Standard error ____________
t-calculated ____________
p-value ____________
t-critical ____________

• statistics -

This looks like an independent groups t-test.

Here are a few hints:
1. d.f. for an independent groups t-test is this: n1 + n2 - 2
2. Use the denominator of the appropriate t-test as the standard error of the difference between the two means.
3. Use the appropriate t-test to calculate the t-test statistic.
4. P-value is the actual level of the t-test statistic (found using a t-table).
5. T-critical can be found using a t-table with the appropriate degrees of freedom for a one-tailed test.

I hope this will get you started.

## Similar Questions

1. ### MATH

a total of 50 juniors and seniors were given a mathematics test.the 35 juniors attained an average score of 80 while the 15 seniors attained an average of 70.what was the averagescore for all 50 students who took the test?
2. ### accounting

Question 5: (50 points) E 5-11 Income (loss) recognition; percentage-of-completion and completed contract methods compared LO4 Brady Construction Company contracted to build an apartment complex for a price of \$5,000,000. Construction …
3. ### Accounting

E 5-11 Income (loss) recognition; percentage-of-completion and completed contract methods compared LO4 Brady Construction Company contracted to build an apartment complex for a price of \$5,000,000. Construction began in 2006 and was …
4. ### statistics

Assume we draw a simple random sample from a population having a mean of 100 and a standard deviation of 16. What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following …
5. ### statistics

In a particular class, there are 3 freshmen, 5 sophomores, 11 juniors, and 2 seniors. If the instructor randomly chooses a student to answer a question in class, what is the probability that the student chosen will be a freshman?
6. ### math

495 Find three coterminal angles: ____________ ____________ ____________ Standard position angle: Reference angle:
7. ### Math

A club consists of 8 seniors, 7 juniors, and 4 sophomores. A subcommittee consisting of 3 seniors, 2 juniors, and 1 sophomore will be chosen. How many different such subcommittees are there?
8. ### Statistics/Math

I want to test H0: p = .12 vs. Ha: p ≠ .12 using a test of hypothesis. This test would be called a(n) ____________ test. A) two-tailed B) right-tailed (this one?
9. ### Statistics

An opinion poll asks a random sample of 100 college seniors how they view their job prospects. In all, 53 say "Good." The 95% confidence interval has a margin of error of 9.9%. The sample used actually included 130 college seniors …
10. ### Math

From a pool of six juniors and eight seniors three co captains will be chosen for the football team. How many different combinations are possible if one junior and two seniors are chosen?

More Similar Questions