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miskamm [114]
2 years ago
7

Express 5 cm in metre and kilometre.in decimals........................

Mathematics
1 answer:
victus00 [196]2 years ago
7 0

Answer:

0.05 metre

5×10^5 kilometer

1.9685

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A psychologist would like to examine the effect of fatigue on mental alertness. An attention test is prepared which requires sub
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Answer:

The calculated value of t= 0.1908 does not lie in the critical region t= 1.77 Therefore we accept our null hypothesis that  fatigue does not significantly increase errors on an attention task at 0.05 significance level

Step-by-step explanation:

We formulate null and alternate hypotheses are

H0 : u1 < u2 against Ha: u1 ≥ u 2

Where u1 is the group tested after they were awake for 24 hours.

The Significance level alpha is chosen to be ∝ = 0.05

The critical region t ≥ t (0.05, 13) = 1.77

Degrees of freedom is calculated df = υ= n1+n2- 2= 5+10-2= 13

Here the difference between the sample means is x`1- x`2= 35-24= 11

The pooled estimate for the common variance σ² is

Sp² = 1/n1+n2 -2 [ ∑ (x1i - x1`)² + ∑ (x2j - x`2)²]

= 1/13 [ 120²+360²]

Sp = 105.25

The test statistic is

t = (x`1- x` ) /. Sp √1/n1 + 1/n2

t=   11/ 105.25 √1/5+ 1/10

t=  11/57.65

t= 0.1908

The calculated value of t= 0.1908 does not lie in the critical region t= 1.77 Therefore we accept our null hypothesis that  fatigue does not significantly increase errors on an attention task at 0.05 significance level

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Identify the sample space of the probability experiment: answering a true or false question.
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What is the sum of all the whole numbers from 1 to 1000?
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

amount repaid = principal + interest

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$7000 = principal . . . . . . . . subtract $840 from both sides of the equation

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I = Prt

840 = 7000·r·4

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The principal was $7000; the interest rate was 3%.

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