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gogolik [260]
3 years ago
10

A scientist is studying the impact of certain vitamins on a person's ability to remember. The sample size for the experimental g

roup was 25. When a two-tailed t test was calculated, the t statistic came out to be 1.54. What are the percent of variance (r 2) and the size of the effect
Mathematics
1 answer:
vovikov84 [41]3 years ago
3 0

Answer:

0.09 average effect

Step-by-step explanation:

Given that the t statistics = 1.54

Sample size (n) = 25

Therefore, variance = t²/n

Variance = 1.54²/25

Variance = 2.372/25

Variance = 0.09

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Which expression is NOT equivalent to 12x + 18y?
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3 years ago
You manage an ice cream factory that makes two flavors: Creamy Vanilla and Continental Mocha. Into each quart of Creamy Vanilla
Mars2501 [29]

Answer:

You should make 250 quarts of Creamy Vanilla and 200 of Continental Mocha to use up all the eggs and cream.

Step-by-step explanation:

This problem can be solved by a first order equation

I am going to call x the number of quarts of Creamy Vanilla and y the number of quarts of Continental Mocha.

The problem states that each quart of Creamy Vanilla uses 2 eggs and each quart of Continental Mocha uses 1 egg. There are 700 eggs in stock, so:

2x + y = 700.

The problem also states that each quart of Creamy Vanilla uses 3 cups of cream and that each quart of Continental Mocha uses 3 cups of cream. There are 1350 cups of cream in stock, so:

3x + 3y = 1350

Now we have to solve the following system of equations

1) 2x + y = 700

2) 3x + 3y = 1350

I am going to write y as function of x in 1) and replace it in 2)

y = 700 - 2x

3x + 3(700 - 2x) = 1350

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You should make 250 quarts of Creamy Vanilla

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You should make 200 quarts of Continental Mocha

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3 years ago
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