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2 years ago

Question 1 a

Mathematics

1 answer:

Savatey [412]2 years ago

5 0

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.

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219.836−78.618 please hurry!!!!!!!!!!!!!

Sonja [21]

Answer:

141.218

Step-by-step explanation:

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2 years ago

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You originally draw a design for an art contest on a 3 in. x 5 in. card. The second phase of the contest requires the drawing to

Bogdan [553]

I'm pretty sure it is 4, 10.5/5 = 2.1 and 8.5/2.1 = 4.047619047619048 which to the nearest tenth is 4.0 or 4......hope this helps,and hope it is correct!!

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2 years ago

The coordinates of parallelogram PVWZ are P(0, 0), V(-p, q), and W(-p - r, q). Find the coordinates of Z without using any new v

Drupady [299]

For the answer to the question above asking to find the coordinates of Z without using any new variables.


Vector WZ equals vector VP, which is (p, -q)
So Z is (-p - r + p, q - q) which is (-r, 0)
I hope my answer helped you.

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2 years ago

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To help restore a beach sand is being added to the beach at a rate of s(t) = 65+24sin(.3t) tons per hour, where t is measured in

Svetach [21]

s(t) = 65+24sin(0.3t)

where t is measured in hours since 5:00 a.m

3-hour period from 7:00 a.m. to 10:00 am

5 am to 7 am = 2 hours

5 am to 10 am = 5 hours

To find the number of tons we take integral of 2 to 5 of s(t)

∫ 2 to 5 s(t) = ∫ 2 to 5 (65+24sin(0.3t))

∫65+24sin(0.3t) dt = 65t - 80 cos(0.3t) + c

Now we plug in the bounds 2 and 5

∫ 2 to 5 (65+24sin(0.3t)) = 255.36787 = 255.268

255.268 tons of sand are added to the beach over the 3-hour period

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2 years ago

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Last year your professor wanted to study the pattern in class grades. The following table contains a sample of grades collected

Maslowich

Answer:

mean = 78.4

median = 77.5

mode = 75

This is Right - skewed (positive skewness) distribution

Step-by-step explanation:

Mean:-

The mean (average) is found by adding all of the numbers together and dividing by the number of items and it is denoted by x⁻

mean = $\frac{64+80+75+98+75}{5}$

mean (x⁻ ) = 78.4

The mean of the given data = 78.4

Median:

The median is found by ordering the set from lowest to highest and finding the exact middle.

64 ,75, 80, 98

The middle term of the given data set = $\frac{75+80}{2} =77.5$

Mode :

The mode is the most common repeated number in a data set.

64 ,75, 75, 80, 98

in data the most common number = 75

Conclusion:-

mean = 78.4

median = 77.5

mode = 75

This is Right - skewed (positive skewness) distribution

8 0

2 years ago