Which of these represent a function

Mathematics

1 answer:

tresset_1 [31]3 years ago

6 0

Answer:

Step-by-step explanation:

None of them

A has (5, 13) and (5,17) That's 2 y values for the same x. You can't have that. A fails the vertical line test.

B has two y values for x = - 3. The two values are (-3,-1) and (-3,1). Both values eliminate B as an answer.

C fails because -1 has 2 y values (-4,52) and (-4,?) We can't see the bottom, but it is another value. There is an x value we cannot see that has 45 as an answer along with -7 for x. That's fine.

If there is a D answer, you almost have to choose it. There isn't much choice.

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A large software company gives job applicants a test of programming ability, and the mean for that test has been 160 in the past

Anastaziya [24]

Answer:

Since the computed value of t= 0.833 does not fall in the critical region we therefore do not reject H0 and may conclude that population mean is greater than 160. Or the sample comes from population with mean of 165.

Step-by-step explanation:

State the null and alternative hypothesis as

H0: μ= 160 against the claim Ha :μ ≠160

Sample mean = x`= 165

Sample standard deviation= Sd= 12

2. The test statistic to use is

t= x`-μ/sd/√n

which if H0 is true , has t distribution with n-1 = 36-1= 35 degrees of freedom

3. The critical region is t< t (0.025(35)= 2.0306

t= x`-μ/sd/√n

4. t = (165-160)/[12/√(36)] = 5/[6] = 0.833

5. Since the computed value of t= 0.833 does not fall in the critical region we therefore do not reject H0 and may conclude that population mean is greater than 160. Or the sample comes from population with mean of 165.

Now

6. The p-value is 0 .410326 for t= 0.8333 with 35 degrees of freedom.