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3 years ago

6

A total of 3 1/4 cups of baking soda was used for multiple trails of a science experiment. Each trail used 3/4 cup of baking sod

a . How many trials were conducted?

1 answer:

Gre4nikov [31]3 years ago

4 0

4 Trials of baking soda was conducted.

3.25 / 0.75 = 4.3 but you cant run a third of a trial so rounded down is 4.

I hope this helped :)

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2 years ago

A researcher is concerned about the impact of students working while they are enrolled in classes, and she likes to know if stud

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Answer:

(a) Point estimate = 7.10

(b) The critical value is 1.960

(c) Margin of error = 0.800

(d) Confidence Interval = (6.3, 7.9)

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Step-by-step explanation:

Given

$\bar x = 7.10$ -- sample mean

$\sigma=5$ --- sample standard deviation

$n = 150$ --- samples

Solving (a): The point estimate

The sample mean can be used as the point estimate.

Hence, the point estimate is 7.10

Solving (b): The critical value

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$CI = 90\%$ --- the confidence interval

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$\alpha = 1 - CI$

$\alpha = 1 - 90\%$

$\alpha = 1 - 0.90$

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$E = z * \frac{\sigma}{\sqrt n}$

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$E = \frac{1.960 *5}{12.25}$

$E = \frac{9.80}{12.25}$

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Solving (d): The confidence interval

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$CI = (\bar x - E, \bar x + E)$

$CI = (7.10 - 0.800, 7.10 + 0.800)$

$CI = (6.3, 7.9)$

Solving (d): The conclusion

We are 90% confident that the average number of hours worked by the students is between 6.3 and 7.9

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