3. A researcher wants to count the number of apps people have downloaded on their phones. Here is the data from four cities: San Francisco 48 37 57 42 31 44 45 53 58 41 Los Angeles 25 32 30 25 50 37 25 42 30 33 Chicago 14 35 29 25 23 27 40 20 32 55 New York 30 22 40 50 30 45 35 42 20 Can we say there is significant difference in the number of downloaded apps amongst people in these cities? (Use a = .10) Type of Test: Null Hypothesis: Alternate Hypothesis: SE: Test Statistic: P-value: Decision: Sentence: 32
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.
A researcher wants to count the number of apps people have downloaded on their phones. Here is the data for the four cites:
San Francisco - 48 37 57 42 31 44 45 53
Los Angeles - 25 32 30 25 50 37 25 42
Chicago - 14 35 29 25 23 27 40 20 32 55
New York - 30 22 40 50 30 45 32 35 42 20
. . . .
Can we say there is significant difference in the. number of downloaded apps amongst people in 'these cities? (Use a= .10)
. . . . . . . . . . .
Type of Test:
Null Hypothesis:
Alternate Hypothesis:
SE:
Test Statistic:
P-value:
Decision:
Sentence:
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