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quester [9]
3 years ago
15

The mean crying time of infants during naptime at a local preschool is 12 minutes. The school implements a new naptime routine i

n a sample of 25 infants and records an average crying time of 8 ± 4.6 (M ± SD) minutes. Test whether this new naptime routine reduced crying time at a 0.05 level of significance.
A) The new naptime routine significantly reduced crying time, t(24) = ?4.35, p <0.05.

B) The new naptime routine did not reduce crying time, t(24) = ?4.35, p < 0.05.

C) The new naptime routine did not reduce crying time, t(24) = 0.92, p > 0.05.

D) The new naptime routine significantly reduce crying time, t(24) = 0.92, p < 0.05.
Mathematics
1 answer:
Pie3 years ago
3 0

Answer:

Step-by-step explanation:

Diadem

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Step-by-step explanation:

We know that complex numbers are a combination of real and imaginary numbers

Real part is x and imaginary part y is multiplied by i, square root of -1

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Here instead of x and y are given 9 and 40

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Hence to find modulus we square the coefficients add them and then find square root

|9+49i| =\sqrt{9^2+40^2} =\sqrt{1681}

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Answer:

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Step-by-step explanation:

Hint- First we have to calculate the mean and standard deviation of the sample and then applying formula for confidence interval we can get the values.

Mean of the sample is,

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Standard deviation of the sample is,

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The confidence interval will be,

=\mu \pm Z\dfrac{\sigma}{\sqrt{n}}

Here,

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Putting the values,

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Confidence interval is used to express the degree of uncertainty associated with a sample.

95% confidence interval means that if we used the same sampling method to select different samples and calculate an interval, we would expect the true population parameter to fall within the interval for 95% of the time.

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Step-by-step explanation:

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