) Which distribution table will be used to find the critical value and why? A.) t-table because the population standard deviation is unknown B.) Z-table because the population standard deviation is unknown C.) Z-table because the population standard deviation is known D.) t-table because the population standard deviation is known b.) With 90% confidence, we can say the true population mean price of cars at this dealership is between $ and $ .
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.
Toby wants to know the average price of new cars at a particular dealearship. He randomly selects a sample of 35 cars and finds that the average price to be $20900$20900 with a standard deviation of $1400$1400. What is the 90% confidence interval for the mean price of cars at this particular dealership?
a.) Which distribution table will be used to find the critical value and why?
A.) t-table because the population standard deviation is unknown
B.) Z-table because the population standard deviation is unknown
C.) Z-table because the population standard deviation is known
D.) t-table because the population standard deviation is known
b.) With 90% confidence, we can say the true population mean price of cars at this dealership is between $ and $ .
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