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3 years ago

H e l p

Mathematics

1 answer:

OLEGan [10]3 years ago

5 0

Answer;

1: when shawn woke up

2: the temperature change is 27

Step-by-step explanation:

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Help me answer these2 questions plz

AlladinOne [14]

First one is c and the second im not sure on

6 0

2 years ago

What is the surface area of a fear with a diameter of 2.7 inches? Use 3.14 for π

GrogVix [38]

Answer:

22.8906 sq in

Step-by-step explanation:

SA of a sphere = 4 π $r^{2}$

r = 2.7 / 2 = 1.35

4 x 3.14 x $1.35^{2}$ = 22.8906

5 0

3 years ago

A study of pollutants showed that certain industrial emissions should not exceed 2.3 parts per million. You believe a particular

Musya8 [376]

Answer:

$t=\frac{3.3-2.3}{\frac{0.4}{\sqrt{9}}}=7.5$

The degrees of freedom are given by:

$df=n-1=9-1=8$

And the p value would be:

$p_v =P(t_{(8)}>7.5)=0.0000346$

Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly higher than 2.3 ppm the safe limit

Step-by-step explanation:

Information provided

$\bar X=3.3$ represent the sample mean in ppm

$s=0.4$ represent the sample standard deviation

$n=9$ sample size

$\mu_o =2.3$ represent the value to verify

$\alpha=0.05$ represent the significance level

t would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to verify if the true mean is higher than 2,3 ppm, the system of hypothesis would be:

Null hypothesis: $\mu \leq 2.3$

Alternative hypothesis: $\mu > 2.3$

The statistic for this case is given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

Replacing the info given we got:

$t=\frac{3.3-2.3}{\frac{0.4}{\sqrt{9}}}=7.5$

The degrees of freedom are given by:

$df=n-1=9-1=8$

And the p value would be:

$p_v =P(t_{(8)}>7.5)=0.0000346$

Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly higher than 2.3 ppm the safe limit

6 0

3 years ago

Simplify the following expression. 23 + 13 + 63 × 63 ÷ 6 =

posledela

Answer:

Here is the answer

Step-by-step explanation: