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Estimate mean age of students. How many must you survey if you wanted to be 99% confident in your result and margin of error is no more than 2 years. Use standard deviation of 4.65.
Using the standard normal distribution tables, what is the area under the standard normal curve corresponding to Z
a set of 4 numbers is selected at random from s 12345678 without replacement. what is the probability thata exactly 2
Draws are made at random with replacement from a box of colored balls with the following compositions.
find the 95 confidence interval for the difference between two means based on this information about two samples.
What percentage of personal checking account customers carry average daily balances in excess of $800? What percentage of the banks customers carries average daily balances below of $200?
Using the following data, test the question of whether an equal number of boys and girls participate in soccer at the elementary level at the .01
1. List all the samples from {a, b, c, d, e} when (a) 2 out of 5 are selected, (b) 3 out of 5 are selected. Count the number of samples in each case. 2. Out of 12 people applying for an assembly iob, 3 cannot do the work. Suppose two persons will b..
How does the bell-shaped curve for the sampling distribution of sample means for samples of size n = 100 compare to the bell-shaped curve for sampling distribution of sample means for samples of size n = 60.
Why is a correlation the most appropriate statistic? What is the correlation between student anxiety scores and number of study hours?
Continuing with the ECCO company from Problem, when a customer returns one of the alarms under warranty, the quality manager logs data on the product.
An observation from a normally distributed population is considered "unusual" if it is more than 2 standard deviations away from the mean. There are several contaminants that can harm a city's water supply.
Parents demonstrate varying levels of warmth, expectations for adherence to rules, and openness of communication with children.
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