Which distribution is symmetrical and bell-shaped?

Which distribution is symmetrical and bell-shaped?

• A. Normal Distribution
• B. Probability
• C. Unit Normal Table
• D. Sampling Error

Answer: (A)

A distribution that is symmetric around its center and has the classic bell shape is the normal distribution. The normal distribution, or Gaussian curve, is centered at the mean and mirrors itself on both sides, with a single peak at that center and tails that extend indefinitely. Its shape is determined by the mean and the spread given by the standard deviation, which controls how wide or narrow the bell is. The other options aren’t distribution shapes: probability is a general idea, the unit normal table is a lookup tool for standard normal probabilities, and sampling error is an error term that arises when estimating a population from a sample. So the distribution that fits the description is the normal distribution.

A distribution that is symmetric around its center and has the classic bell shape is the normal distribution. The normal distribution, or Gaussian curve, is centered at the mean and mirrors itself on both sides, with a single peak at that center and tails that extend indefinitely. Its shape is determined by the mean and the spread given by the standard deviation, which controls how wide or narrow the bell is. The other options aren’t distribution shapes: probability is a general idea, the unit normal table is a lookup tool for standard normal probabilities, and sampling error is an error term that arises when estimating a population from a sample. So the distribution that fits the description is the normal distribution.