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2 years ago

Whitch statement is true?

Mathematics

1 answer:

Natasha_Volkova [10]2 years ago

4 0

Answer:

I think it’s D

Step-by-step explanation:

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An article presents a study of the failure pressures of roof panels. A sample of 15 panels constructed with 8-inch nail spacing

wariber [46]

Answer:

There is sufficient evidence to conclude that six inches spacing has a higher mean failure pressure than 8 inches

Reject $H_0\ at\ 5%$ level of significance

Step-by-step explanation:

From the question we are told that:

Sample size 1 $n_1=15$

Spacing 1 $s_1=8$

Mean 1 $\=x_1=8.48$

Standard deviation 1 $\sigma_1=0.96 kPa$

Sample size 2 $n_2=16$

Spacing 2 $s_2=6$

Mean 1 $\=x_1=9.93$

Standard deviation 1 $\sigma_1=1.02 kPa$

Generally the hypothesis is mathematically given as

Null $H_0:\mu_1-\mu_2$

Alternative $H_a:\mu_1\mu_2$

Generally the equation for pooled estimate is mathematically given by

$S=\sqrt{\frac{(n_1-1)\sigma_1^2+(n_2-1)\sigma_2^2}{n_1+n_2-2} }$

Therefore

$S=\sqrt{\frac{(15-1)0.96^2+(16-1)1.02^2}{15+15-2} }$

$S=0.9905$

Generally the equation for test statistics is mathematically given by

$t=\frac{\=x_1+\=x_2}{S\sqrt{\frac{1}{n _1}+\frac{1}{n_2}}}$

$t=\frac{\=8.48-9.93}{0.9905\sqrt{\frac{1}{15}+\frac{1}{15}}}$

$t=-4.00091$

Therefore From table

$P value=P(t_{15+15-2}=4.00091)$

$P value=0.00041918$

$P$

Therefore

There is sufficient evidence to conclude that six inches spacing has a higher mean failure pressure than 8 inches

Reject $H_0\ at\ 5%$ level of significance

3 0

2 years ago

Help please please!!!!

Fantom [35]

Answer:

The answer should be 120*

Hope this helped, can I have brainliest?

8 0

2 years ago

What is -6n+5=1? Thanks!

ivann1987 [24]

You subtract 5 to the other side so it'll read -6n=-4 then divide -6 to the other side and it'll be 2/3

6 0

2 years ago

Read 2 more answers

Three friends went running.

Blababa [14]

Answer:

3 miles

Step-by-step explanation: cause i did this

8 0

2 years ago

8. To which subsets of the real numbers does the number 13 belong?

Veronika [31]

Answer:

irrational numbers

Step-by-step explanation:

sqrt(13) is not a whole number, a natural number, an integer, or a rational number.

Answer: irrational numbers

5 0

2 years ago