Question

In a hypothetical study, researchers found that the average donut sold by Krispy Kreme contains 260 calories, with a standard deviation of 35 calories. At stores where calorie information was located next to the menu items, the average donut sold contained only 240 calories.
Based on this information, Cohen's d equals:

A)-.57 B)1.75 C).57 D)-1.75

Answer 1

Answer:

Option C) 0.57

Step-by-step explanation:

We are given the following in the question:

Average, $\mu_0$ = 260 calories

Standard deviation, $\sigma$ = 35 calories

$\mu_1$ = 240 calories.

We have to find the Cohen's d effective size.

Formula:

$d = \bigg|\dfrac{\mu_1 - \mu_0}{\sigma}\bigg|\\\\d = \bigg|\dfrac{240-260}{35}\bigg|\\\\d = 0.57$

Thus, the Cohen's d effective size is 0.57

Thus, the answer is

Option C) 0.57