Answer:
Harold needs to get more than 91 on his second test
Step-by-step explanation:
Harold wants to get average of Two test grades in math class is atleast 84.
He got 77 on the first test. and Let x be the score of second test.
Average of two test is
Average is atleast 84. The inequality becomes
Now solve the inequality for x
Multiply both sides by 2
Subtract 77 from both sides
Harold needs to get more than 91 on his second test
Answer:
the residual is 0.2032
Step-by-step explanation:
The regression line has been given as:
Y^ = 0.00753X-0.06759
The paired observation for X is (31, 0.369)
The value of X is the empathy score under subject 15 = 31
The value of the brain activity under subject 15 is 0.369
So we have y^ = 0.00753(31) - 0.06759
= 0.1658
Then the residual = y - y^
= 0.369 - 0.1658
= 0.2032
Therefore the residual is 0.2032
Please check the attachment for the table, it will aid you in understanding the solution
Answer:
First of all, we need to determine the system of hypothesis, which must have a null and alternative hypothesis.
In all hypothesis proof procedure, we must work with the null one, rejecting it or accepting it. If we reject the null hypothesis, it will mean that our principal hypothesis is true.
According to the problem, the null hypothesis must be: ; because it says that 100 is the normal mean that is used.
The alternative hypothesis must be: ; because the question is asking if there's enough evidence to say that they children have a higher IQ than 100.
Then, we must calculate the P-value, which is the probability value that we are gonna use to accept or reject the null hypothesis. This P-value we can calculate it with the formula: ; where x is the sample mean, u is the hypothetical mean parameter, o is the sample deviation and n is the sample.
Extracting all values from the problem: x = 104.3; u = 100; o = 14 and n = 20.
Applying all values to the formula:
Then, this Z-value will give us the P-value by using the Z-table with the 0.05 level of significance. In table attached, we can see that the result is 0.9265. However, the P-value is 1 - 0.9265 = 0.735. We need to do this subtraction because, the result 0.9265 belong to the bigger area (as it's shown is the image in blue colour), and we need the smaller area, which belong to the 0.05 level of significance.
<em>In this problems, if the P-value is more than the level of significance, the null hypothesis is accepted. If the P-value is less than the level of significance the null hypothesis is rejected.</em>
Therefore, there is no enough evidence to say that the sample children have higher IQs, because the P-value is higher than the level of significance. (0.735>0.05).
