I would say the correct answer is D.
It corresponds with the statement made in the question, saying that 95%(the majority) of customers who rated the store as having high quality service returned.
Answer: Yes! those are indeed apart of the fact family
Step-by-step explanation:
Notice that 9+5=14 and 5+9=14, thus the first two equations
show that if we add two numbers in any order, we get the same answer.
Notice that 14-9=5 and 9+5=14, so subtraction and addition are
related. Similarly 14-5=9 and 5+9=14
Notice that 14-9=5 and 14-5=9, so if you subtract one of the
members of the fact family from 14, you get the other.
Answer:
B) A one-sample t-test for population mean would be used.
Step-by-step explanation:
The complete question is shown in the image below.
The marketing executive is interested in comparing the mean number of sales of this year to that of previous year.
The marketing executive already has the value of mean from previous year and uses a sample to calculate the mean and standard deviation of sales for the current year.
Since, data is being collected for one sample only this limits us to chose between one sample test for mean. So now the possible options are one sample t-test for population mean and one sample t-test for population mean.
If we read the statement we can see that we have the value of sample mean and sample standard deviation. Value of population standard deviation is unknown. In cases where value of population standard deviation is not known and sample standard deviation is given, t-test is used.
Therefore, we can conclude that A one-sample t-test for population mean would be used.
25 = -16t^2 + 50t + 4
16t^2 - 50t + 21 = 0
16t^2 - 8t - 42t + 21 = 0
8t(2t - 1) - 21(2t - 1) = 0
(8t - 21)(2t - 1) = 0
8t - 21 = 0 or 2t - 1 = 0
t = 21/8 or t = 1/2
t = 2.625 or t = 0.5