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Question: Who owns iPods? Refer to Exercise. Carry out a significance test at the a = 0.05 level.
Exercise: Who owns iPods? As part of the Pew Internet and American Life Project, researchers surveyed a random sample of 800 teens and a separate random sample of 400 young adults. For the teens, 79% said that they own an iPod or MP3 player. For the young adults, this figure was 67%. Do the data give convincing evidence of a difference in the proportions of all teens and young adults who would say that they own an iPod or MP3 player? State appropriate hypotheses for a test to answer this question. Define any parameters you use.
For the following stock price one-year percentage changes, plot the data and identify any outliers. Find the mean and median.
after 6 quizzes you have a mean score of 50out of a possible 70. if 60 on next quiz what new mean?what is the maximun
Identify the predictor variable and the criterion variable in their study based on the following description.
Compute the mean and median.Compute the variance, standard deviation, range, and co-efficient of variation.Are the data skewed? If so, how?
Think about a real life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years?
The manufacturer of Feel Better aspirin advertises that 60% of pediatricians recommend Feel Better for children under twelve. Safe and Sound, a rival manufacturer
If X and Y are two independent Poisson random variables, then show that the conditional distribution of X given X+Y is binomial.
1. a government watchdog association claims that 70 of people in the u.s. agree that the government is inefficient and
A sustained long-term change in the level of the variable that is being forecasted per unit of time is: (A trend, A time series, Seasonality or A change due to business cycles)
to find the sample size needed for a hypothesis test if ho mu10 ha mult10 sigma is unknown alpha 0.01 beta 0.05 and e
Which player has scored more on an average? Which player is more consistent in his performance. Claculate mean deviation from the median for the following data.
Select the study that is most appropriate and EXPLAIN WHY it is most appropriate for the study.
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