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The total purchase of shoppers in a certain department store is normally distributed with an average of $50.00, and a standard deviation of $4.00. If the store takes a random sample of 100 shoppers exiting the store, what is the standard deviation of the sample-mean purchase? What is the probability that the sample-mean purchase will exceed $51.00?
A private medical clinic wants to estimate the true mean annual income of its patients. If the confidence level is 95%, find the required sample size in order to meet the needs.
how do you find chi square left and chi square right using the ti-84 plus given that you know the confidence level
The amounts of money requested on home loan applications at a particular bank follow the normal distribution, with a mean of $80,000 and a standard deviation of $24,000. A loan application is received during the day.
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 69.09 inches and standard deviation s of 4.71 inches.
1. provide one research hypothesis and an equation for each of the following topicsa. the amount of money
If a manufacturer charges x dollars each for soccer balls, then he can sell 3000 - 150x soccer balls per week. Find a polynomial that represents the revenue for one week.
If the same sample results had been obtained from a random sample of 16 students, could the students' claim be accepted at a lower level of significance?
which of the following describes the effect of increasing sample size?measures of effect size and the likelihood of
You are curious about whether the professors and students at your school are of different political persuasions, so you take a sample of 20 professors and 20 students drawn randomly from each population.
a coin is tossed 4 times and the sequence of heads and tails is observed.a. what is the probability that heads and
Sketch density curves that might explain distributions with fallowing shapes: symmetric, but with two peaks( i.e., two strong clusters of observations)
A sample is taken prior to a major election of likely voters. The null hypothesis is that the votes will be split 50/50. One candidate gets 54% of the support in the sample and the p-value for this sample is calculated to be 0.12.
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