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Estimating the sample standard deviation using normal score.
For a sample with a mean of M = 85, a score of X = 90 corresponds to z = 0.50. What is the sample standard deviation?
Statistics and Probability, Statistics
There are 20 total socks, 10 white and 10 black. This makes 10 total matching pairs of 5 pair of white and 5 pair of black. If each time you pick a sock from the drawer a sock just like it magically replaces it, what is ...
A pharmaceutical company claims that the average cold lasts an average of 8.4 days. They are using this as a basis to test new medicines designed to shorten the length of colds. A random sample of 106 people with colds, ...
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A social psychologist recently developed a childhood memories test that is intended to measure how people recall pleasant and unpleasant memories from childhood. Scores on this test range from 1 (very unpleasant) to 100 ...
Assume that the distribution of the number of chocolate chips in Chips Ahoy regular cookies is approximately normal with a mean of 24.0 chips and a standard deviation of 2.6 chips. N(24.0, 2.6). 1) What is the number of ...
Stock Valuation Gruber Corp. pays a constant $9 dividend on its stock. The company will maintain this dividend for the next 12 years and will then cease paying dividends forever. If the required return on this stock is 1 ...
The caloric consumption of 44 adults was measured and found to average 2,113. Assume the population standard deviation is 270 calories per day. Construct confidence intervals to estimate the mean number of calories consu ...
A bullying prevention program is underway in the phoenix school districts. The researchers ran multiple analyses with the baseline data. The researchers want to determine if there is a relationship between age (13, 14, 1 ...
On the ballot, Illinois voters had the option to select "yes" or "No" when asked if the state's minimum wage should be increased from $8.25 to $10 an hour by January 1, 2015. Before the actual voting date, a survey with ...
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