Determine the standard error
A researcher chooses a sample of 25 participants from population that has mean IQ of 100 and standard deviation of 15. Determine the standard error for this sample?
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If her school is a representative sample of the state, determine a 90% confidence interval estimate of average amount of time (µ) the students work at an after school job in her state.
Determine the minimum samply size needed, using a prior study that found that 32% of the respondents said they have high-speed internet access.
Determine the mean and standard deviation for the number of high school graduates in groups of 1340 Americans over the age of 25.
A researcher is conducting study to estimate how knowledgeable teenagers are regarding making good food choices. She decides to interview teenagers eating at the fast food restaurent. Why may the results be biased?
Determine the probability that it takes him exactly 55 tries to complete the drill? On average, how many tries does it take him to complete the drill?
A basketball coach ends every practice with a free throw drill in which he needs each player to sink 20 free throws. Suppose one player has free throw percentage 35%.
The lengths of specific animal's pregnancies are approximately normally distributed , with mean u = 262 days and standard deviation o = 12 days. What proportion of pregnancies last more than 280 days?
The US Bureau of Labor Statistics publishes the monthly CPI (consumer price index). The index showes the changes in prices by urban consumers for market basket of goods and services. These date are (fill in blank).
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