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snow_tiger [21]
3 years ago
10

According to a recent report, customers who shop at a certain online store spend, on average, s1,500 a year at the store. To inv

estigate whether the mean amount spent was greater than the reported averag obtained the mean and standard deviation of the amount spent in the past year by a random sample of 120 customers who shop at the store. With all conditions for inference met, the economist conducted the appropriate hypothesis test and obtained a p-value of 0.25. Which of the following statements is the most appropriate conclusion for the investigation?
(A) There is convincing statistical evidence that the mean amount of money spent each year by all customers who shop at the store is $1,500. who shop at the store is greater than $1,500. who shop at the store is less than $1,500. who shop at the store is greater than $1,500.
(B) There is convincing statistical evidence that the mean amount of money spent each year by all customers
(C) There is convincing statistical evidence that the mean amount of money spent each year by all customers
(D) There is not convincing statistical evidence that the mean amount of money spent each year by all customers
(E) The ere is not convincing statistical evidence that the mean amount of money spent each year by any sample of 120 customers who shop at the store is greater than $1,500.
Mathematics
1 answer:
kipiarov [429]3 years ago
4 0

Answer:

There is convincing statistical evidence that the mean amount of money spent each year by all customers who shop at the store is $1,500.

Step-by-step explanation:

We must recall that the investigator wishes to investigate whether the mean amount spent was greater than the reported average obtained the mean. From this, we have the following hypothesis:

Null hypothesis (H_{0}):               \mu_{0} = $1500

Alternative hypothesis (H_{1}):    \mu_{0} > $1500

We assume the level of significance (\alpha) = 5%.

We are told that all conditions for inference are met, and the economist conducted the appropriate hypothesis test and obtained a p-value of 0.25.

Based on statistical test conclusion, if p-value is higher that the level of significance (\alpha), we conclude that the test is insignificant, otherwise, it is significant.

The p-value is given as 0.25 and this value is higher than level of significance (\alpha) = 0.05. Hence, the test is insignificant. This simply means that, nothing new is discover. Thus, the claim or recent report that customers who shop at a certain online store spend, on average, $1,500 a year at the store is TRUE.

We therefore conclude that, <em>there is convincing statistical evidence that the mean amount of money spent each year by all customers who shop at the store is $1,500.</em>

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79 inches

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the captain of a boat knows that the lighthouse on the coast is 200 feet tall. he measures the angle of elevation to the top of
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The boat is 5727.25ft far from the coast

Step-by-step explanation:

Refer the figure given.

We need to find how far is the boat from the coast = AB

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We have

           tan2=\frac{AC}{AB}=\frac{200}{AB}\\\\AB=\frac{200}{tan2}=5727.25ft

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3 years ago
Which describes the cross section of the square prism that passes through the vertices A, B, C, and D shown
sasho [114]

Answer:

first of all,

Step-by-step explanation:

In triangle ABC one side equal  and two sides equal  

Step-by-step explanation:

We are given a prism whose base is square with sides 8 in and height 12 in.

If we take cross section through vertices A, B and C

We will get a cross section as triangle.

In triangle ABC, sides are AB, BC and AC

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AC is face diagonal of front face.

BC is face diagonal of right face.

AC=BC≠AB

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Hope this helps!!

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What is the domain of the ordered pairs?
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Answer:

b.  {-3, -1, 2}

Step-by-step explanation:

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The <u>domain</u> is the set of input values (x-values)

The <u>range</u> is the set of output values (y-values)

Therefore, for the given ordered pairs (-1, 0), (2, 4) and (-3, 6)

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Vadim26 [7]

Answer:

u=-6 \\ \\ v=-6

Step-by-step explanation:

In this exercise, we have two equations, namely:

u=v \ and \ 6u=2v-24

And we are asked to solve this problem by graphing. In this way, we can write a system of linear equations in two variables, but first of all, let's rewrite:

u=y \\ \\ v=x

Then:

\left\{ \begin{array}{c}y=x\\6y=2x-24\end{array}\right.

So here we have two lines.

The first one is:

\boxed{y=x}

This line passes through the origin and has a slope m=1

The second one is:

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This line has a slope m=\frac{1}{3} and cuts the y-axis at b=-4

By using graph tools, we get the graph shown below, then:

x=-6 \\ \\ y=-6 \\ \\ \\ Since \ u=y \ and \ v=x, then: \\ \\ u=-6 \\ \\ v=-6

8 0
3 years ago
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