140,000 cm³ of plywood is needed to make the prop.
Explanation:
The dimensions of the required box are 70cm × 40cm × 50cm.
So we take the length equals 70cm, the width is equal to 40cm and the height is 50cm. The volume of this box is calculated by multiplying the given box's length, its width, and its height. The question does not provide which measurement is which but ultimately the volume will be equal no matter what the case.
To answer you question, we need the confidence internals formula, μ±Zc*(σ/); N is the 20 psychology students, 0.5 the desviation standar and 4.3 is the medium based on national data, every fact in years.
Step-by-step explanation:
You need to consult the Zc value, you can find this table attached in this question; for 95%, we have a Zc value of 1.96.
Next step replace values: 4.3±1.96*(0.5/) = 4.3±0.22 (rounding the result)