![]() It is also the upper one-sided N(0, 1) critical value and two-sided N(0, 1) critical value for the significance levels given in columns two and three, respectively. The fourth column is the N(0, 1) percentile for the percent given in column one. and (3) the cumulative distribution function at, orĬritical values (percentiles) for the standard normal distribution. The NORM.S.DIST function can be used to determine the probability that a random variable that is standard normally distributed would be less than 0.5. ![]() ![]() For selected values of three values are tabled: (1) the two-sided -value, or Right Tail 2 Distribution Critical Values. ![]() Let be a normal random variable with mean zero and variance one. This table gives the area under the normal curve between the mean and a point Z standard deviations above the mean. Table entry for z is the area under the standard normal curve to the left of z.
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