Mean of a normal distribution
The mean of a normal distribution is 406 pounds. The standard deviation is 10 pounds. What is the area between 422 pounds and the mean of 406 pounds?
0.2226
0.8904
0.4452
0.3116
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If the null hypothesis that two means are equal is true, where will 99% of the computed z-values lie between?
A bank wishes to estimate the mean credit card balance owed by its customers. The population standard deviation is estimated to be $297. If a 98 percent confidence interval is used and an interval of $84 is desired, how many customers should be sa
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IS there evidence to suggest the proportion of males who feel air travel is now safer is greater than the proportion of females? Complete your analysis based on odds ratios.
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