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Conceptually we would expect the probability of newborn males and females to be the same. However, census reports indicate that the ratios of males and females in various countries do not conform to the theoretical prediction. What do you think accounts for this variation? Can you think of other cases where the expected probabilities do not quite agree with the empirical values?
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
Create a frequency table for the total number of people that prefer each type of music:
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
Write Cumulative distribution function.Find the cumulative distribution function F(x).
Create a 99 percent confidence interval for mean daily intake of milk. You may suppose daily intake amounts are usually distributed.
The following study was developed by Economist Simon Fass. Fass surveyed a sample population of low-income households in St. Martin. The variables analyzed were monthly income per adult and choice of rental contract for housing.
Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.
To estimate the true proportion of students who abstain from alcohol at LBCC, you will need to take a simple random sample.
Make for more scatter plots comparing GDP growth 1970-2000 to corruption, political rights, rule of law, and socio-political instability
A civil service exam is given to 200 job applicants. In recent years, grades have followed a normal distribution with mean 66.5 and variance 100. The grades of the job applicants are distributed as follows:
Assume that you are conducting a survey of customer satisfaction regarding their cellular phone.
Students in the social work course received the following course grades. Create a frequency distribution for this data. Compute the mean. Determine the median.
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