The average expenditure on Valentine's Day was expected to be $100.89. The average expenditure in a sample survey of 40 male consumers was $138.29 and the average expenditure in a sample survey of 30 female consumers was $61.66. Based on past surveys, the standard deviation for male consumers is assumed to be $32, and the standard deviation for female consumers is assumed to be $14. The z value is 2.576. 1. What is the point estimate of the difference between the population mean expenditure for males and population mean expenditure for females?
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
The average expenditure on Valentine's Day was expected to be $100.89. The average expenditure in a sample survey of 40 male consumers was $138.29 and the average expenditure in a sample survey of 30 female consumers was $61.66. Based on past surveys, the standard deviation for male consumers is assumed to be $32, and the standard deviation for female consumers is assumed to be $14. The z value is 2.576.
1. What is the point estimate of the difference between the population mean expenditure for males and population mean expenditure for females?
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