HELP URGENT WILL GIVE BRAINLIEST
1 answer:
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Answer:
The null hypothesis failed to be rejected.
There is not enough evidence to support the claim that the commercial improved the mean purchase potential rating.
Step-by-step explanation:
If we calculate the difference in ratings we have:
After Before Difference
1 6 -5
5 2 3
6 4 2
3 7 -4
7 4 3
4 3 1
5 3 2
5 6 -1
9 8 1
7 7 0
5 8 -3
6 6 0
We will calculate the mean and standard deviation of the difference to test them later.
The sample size is n=12.
The mean is:
The standard deviation is:
The null hypothesis states that the mean rating "after" would be less than or equal to the mean rating "before." The alternative hypothesis states that the mean rating difference is greater than 0.
Then, the null and alternative hypothesis:
The significance level is 0.05.
The sample has a size n=12.
The sample difference is d=-0.083.
As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=2.678.
The estimated standard error of the mean is computed using the formula:
Then, we can calculate the t-statistic as:
The degrees of freedom for this sample size are:
This test is a right-tailed test, with 11 degrees of freedom and t=-0.108, so the P-value for this test is calculated as (using a t-table):
As the P-value is greater than the significance level, the effect is not significant. The null hypothesis failed to be rejected.
There is not enough evidence to support the claim that the commercial improved the mean purchase potential rating.
Answer
A. XY and ST
B. VU and TW
D.TX and WX
Step-by-step explanation:
The question is on volume of a hexagonal right pyramid
The formula for volume of hexagonal right pyramid is
where a is the base length and h is the height of the pyramid.
So to get the volume, you need to find the base area then multiply it by the height.
Let observe the lengths that can help you in calculating the volume.
Length XY is important because it is a base length
Length st is important because it is the height of the pyramid
Length VU/YZ is important because it is a base length
Length TW/TX is important because it could help you determine the slant height and if the apothem length is given, you can determine the height TS
Length XW is important because it is a base length
Length XS is not important because it is not the apothem length.Apothem length is a perpendicular bisector of the base length originating from the center of the pyramid
Therefore the correct pairs of lengths are ;
A. XY and ST
B. VU and TW
D.TX and WX