The owner of a specialty coffee shop wants to study coffee purchasing habits of customers at her shop. She selects a random sample of 60 customers during a certain week, with the following results: • The amount spent was X = $7.25, S = $1.75. • Thirty-one customers say they “definitely will” recommend the specialty coffee shop to family and friends. a. At the 0.05 level of significance, is there evidence that the population mean amount spent was different from $6.50? d. What is your answer to (a) if the sample mean equals $6.25?
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.
Happy Sunday! I asked you all to answer the question below and you did. Can you tell me why in Step #1 "N" is 30 and not 60? I thought to get the standard error you divide the standard deviation of the population/ the square root of the
The owner of a specialty coffee shop wants to study coffee purchasing habits of customers at her shop. She selects a random sample of 60 customers during a certain week, with the following results:
• The amount spent was X = $7.25, S = $1.75. • Thirty-one customers say they “definitely will” recommend the specialty coffee shop to family and friends.
a. At the 0.05 level of significance, is there evidence that the population
d. What is your answer to (a) if the sample mean equals $6.25?
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