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Bess [88]
3 years ago
15

Joan’s Nursery specializes in custom-designed landscaping for residential areas. The estimated labour cost associated with a par

ticular landscaping proposal is based on the number of planting of trees, shrubs, and so on to be used for the project. For cost-estimating purposes, managers use two hours of labour time for the planting of a medium-sized tree. Actual times from a sample of 10 planting during the past month follow (times in hours).
1.7 1.5 2.6 2.2 2.4 2.3 2.6 3.0 1.4 2.3
Test to see whether the mean tree-planting time differs from two hours.
State the null and alternative hypothesis
Mathematics
1 answer:
Shkiper50 [21]3 years ago
6 0

Answer:

H0 : μ = 2

H1 : μ > 2

We fail to reject the null and conclude that no significant evidence exists to support that mean tree-planting time differs from two hours.

Step-by-step explanation:

Given :

X = 23.71,17.79,29.87,18.78,28.76

Sample mean, xbar = Σx / n = 22/10 = 2.2

Standard deviation, s = 0.516 (calculator)

H0 : μ = 2

H1 : μ > 2

Test statistic :

(xbar - μ) ÷ (s/sqrt(n))

n = 10

Test statistic :

(2.2 - 2) ÷ (0.516/sqrt(10))

0.2 / 0.1631735

Test statistic = 1.23

Using the Pvalue from Tscore calculator, df = n - 1 = 10 - 1 = 9

Pvalue(1.23, 9) = 0.1249

Since, Pvalue > α ; We fail to reject the null and conclude that no significant evidence exists to support that mean tree-planting time differs from two hours.

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What is the value of x? x−2/5=7 Enter your answer in the box in simplest form. x =
fenix001 [56]

Answer:

Your answer is 17.5

Step-by-step explanation:

Turn your fraction into a decimal

2/5 = 0.4

Next multiply my given answer by 0.4

17.5 x 0.4 = 7

Therefore 17.5 is your final answer

3 0
3 years ago
Kyle already knew 19 appetizer recipes before starting culinary school, and he will learn 1
Bess [88]
So you know he starts off with 19. This is the first term. He learns one more each week, so let’s assign this the variable w.

19+1w

Set this equal to 47, since you’re solving how many to get to 47 recipes.

19+1w=47

To find out how many weeks, isolate the variable. Begin by combining like terms. Move the 19 to the side of the 47 by subtracting.

19+1w=47
-19 -19
—————-
1w= 28

To further isolate w, divide both sides by 1. This removes the coefficient from w and isolates it.

1w=28
—- ——
1 1

w=28

This means it will take him 28 weeks to learn 47 appetizer recipes in total. To check this answer, simply plug it back into the original equation.

19+1(28)=47
19+28=47
47=47

This means the answer is right, it will take 28 weeks.

I hope this helps! Please comment if you need any more explanation and I’ll get back to you ASAP.
6 0
3 years ago
Find the valu<br> B<br> 6<br> 8<br> A<br> Х<br> D<br> 4<br> С<br> x = [?]
AnnyKZ [126]

Answer:

hmm... A is the answer but if anything comes up tell me

8 0
3 years ago
The table shows the linear relationship between the
mr Goodwill [35]

Answer:

C

Step-by-step explanation:

Y=8x + 0.25

3 0
3 years ago
Topic: Finite Geometric Sums <br> what is the value of ..
Juli2301 [7.4K]
For i=1 ===> Sum=4

for i=2===> Sum=2

for I=3===> Sum=1

Hence the answer is 7

Or you could have use the Sum formula of a GP:

Sum = a(1-r)^n/(1-r), with a=1, r=1/2 & n=3
6 0
3 years ago
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