Answer:
72
Step-by-step explanation:
For Q 1 : 25 % of the scores are below this value. The area under the bell-shaped curve of the normal distribution is 0.25. And since we have 288 electricians that took a certification test:
0.25 * 288 = 72.
Answer:
c) t-test of population mean
Explanation:
The t-test statistic is used in hypothesis testing. Here we would use a one sample t test to test our hypothesis. The one sample t test measures the statistical difference between the hypothesized mean and the sample mean. In a one sample t test or single sample t test, a test variable is measured against a test value.
Example we compare our test variable to the hypothesized mean value $75 above.
The t test is used instead of z score when standard deviation is unknown.
Using the t test, we either accept or reject the null hypothesis given alternative hypothesis.
Answer:
Step-by-step explanation:
Hello,
It means that
And we know that
So we got two equations
For 
For 
I assume that we are after two different roots so the solution for p is p=-11
b) 
So a quadratic equation with the expected roots is
Hope this helps.
Do not hesitate if you need further explanation.
Thank you
Answer:
Step-by-step explanation:
u = 45
v = 30
Angle between them, θ = 5π / 6 = 150°
(a) The formula for the dot product is given by
(b) 
Let the angle between them is θ
The formula in terms of the dot product is given by
θ = 75°
(c) 
700 people were surveyed.
SOLUTION
70/10%
=700
Or
7 x 10^2
=700
HOPE THIS HELPS!! :))
