Two conditions under which we can assume that the sample means follow a normal distribution are as follows:
1). If the sample size is large enough, n greater than or equals 30, the sampling distribution is approximately normal regardless of the shape of the population.
2). In order to be considered a normal distribution, a data set (when graphed) must follow a bell-shaped symmetrical curve centered around the mean.
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Answer: Top right corner (northeast corner)
Angle IAE = Angle DAH
These two angles are vertical angles as shown in the diagram below. Vertical angles are always congruent.
Answer: A...................................
Answer:
Random, because he surveyed 30 <em>random</em> shoppers
Notice this is a geometric progression since each number multiplied by some factor equals the next number in the sequence, in this case,
![10 \times r = 5 \Rightarrow r=0.5](https://tex.z-dn.net/?f=10%20%5Ctimes%20r%20%3D%205%20%5CRightarrow%20r%3D0.5)
Then by applying the formula for sum to infinity of a geometric progression,