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3 years ago

Identify the error below and make a correction,

Mathematics

1 answer:

stiks02 [169]3 years ago

6 0

Answer:

the absolute value of -15 is 15 because you are basically moving 30 spaces to the right to make the number positive

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2 years ago

Convert -18° to radians.

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The answer is 0.314 radian

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3 years ago

Read 2 more answers

Please someone help me

hram777 [196]

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3 years ago

1. 267.935:39= 2. 689.354:78= 3. 96.873:56=

USPshnik [31]

Question 1.) 267.935:39=

Answer 1.) 6.870 approximately

Question 2.) 689.354:78

Answer 2.) 8.838 approximately

Question 3.) 96.873:56

Answer 3.) 1.730 approximately

Explanation : Since the numerators are expressed in thousandths, the answers must be expressed in thousandths too.

Hope this helps!

$\textit{\textbf{Spymore}}$

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3 years ago

An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W. From pre

melamori03 [73]

Answer:

We conclude that a compact microwave oven consumes a mean of more than 250 W.

Step-by-step explanation:

We are given that an appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W with a population standard deviation of 15 W.

They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.

Let $\mu$ = mean power consumption for microwave ovens.

So, Null Hypothesis, $H_0$ : $\mu$ $\leq$ 250 W {means that a compact microwave oven consumes a mean of no more than 250 W}

Alternate Hypothesis, $H_A$ : $\mu$ > 250 W {means that a compact microwave oven consumes a mean of more than 250 W}

The test statistics that would be used here One-sample z test statistics as we know about the population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\bar X$ = sample mean power consumption for ovens = 257.3 W

σ = population standard deviation = 15 W

n = sample of microwave ovens = 20

So, the test statistics = $\frac{257.3-250}{\frac{15}{\sqrt{20} } }$

= 2.176

The value of z test statistics is 2.176.

Now, at 0.05 significance level the z table gives critical value of 1.645 for right-tailed test.

Since our test statistic is more than the critical value of t as 2.176 > 1.645, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that a compact microwave oven consumes a mean of more than 250 W.

7 0

2 years ago