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From these data, estimate the average height of all adults and calculate a bound on the error of estimation (assume that approximately 50% of adults are male).
male: n=20, mean=69.30, variance=2.812
female: n=20, mean=64.95, variance=2.929
The edges of a triangular homesite have lengths of 2x - 1, x, and x + 2. Write an expression for the perimeter of the property.
Two popular over-the-counter antacids are compared to determine which brand is preferred. Three hundred subjects are randomly selected then divided into two groups of 150 each, and given one of the two antacids.
A crossover trial is planned to evaluate the impact of an educational intervention program to reduce alcohol consumption in patients determined to be at risk for alcohol problems
Draw the frequency polygon for these data using an initial class boundary of 21.5, an ending class boundary of 46.5 and 5 classes.
A population is normally distributed, with a mean of 23.45 and a standard deviation of 3.8. What is the probability of each of the following?
Based on a P-value of 0.0248 the researchers concluded there was evidence that low birth weights may be a risk factor for susceptibility to depression. Explain in context what the reported P-value means.
the lottery game has participants choose 5 different numbers from 1 - 44. the winner is someone who has chosen the
A manufacturer of computers claims its batteries last an average of 3.5 hours before needing recharging. For a sample of 10 batteries, the mean life was 3 hours and the standard deviation
1 create the regression equation that predicts an indivisuals political attitudes based on the number of times thhey
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
Use the sales forecaster's, predictions to describe a normal probability distribution that can be used to approximate the demand distribution.
Tourism is one consideration for CoffeeTime's future. A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small cafe during their visit. Laura claims that 10% of tourists will include a visit to a cafe.
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