"Domestic cats kill many more wild birds in the United States than scientists thought," states a recent article.1 Researchers used a sample of n=140 households in the US with cats to estimate that 35% of household cats in the US hunt outdoors. A separate study2 used KittyCams to record all activity of n=55 domestic cats that hunt outdoors. The video footage showed that the mean number of kills per week for these cats was 2.4 with a standard deviation of 1.51. Find a 99% confidence interval for the mean number of kills per week by US household cats that hunt outdoors?
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.
"Domestic cats kill many more wild birds in the United States than scientists thought," states a recent article.1 Researchers used a sample of n=140 households in the US with cats to estimate that 35% of household cats in the US hunt outdoors. A separate study2 used KittyCams to record all activity of n=55 domestic cats that hunt outdoors. The video footage showed that the
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