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Do younger people use Facebook Messenger more than older people? A random sample of Facebook Messenger uses found that 73 of the 158 people in the sample aged 18 to 27 said they used Messenger more often than email. In the 28 to 39 age group, 26 of 143 people used Messenger more often than. Is this convincing evidence that younger people are more likely to use Messenger? Perform your test at the 5% level and make sure that you use statistical evidence to back your claim.
suppose that 28 of the population has high blood pressure. in a random sample of 200 people what is the exact
A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. What is the expected value of the average weekly income of all the recent graduates?
Market research Before bringing a new product to market, firms carry out extensive studies to learn how consumers react to the product.
Twenty one out of 100 randomly selected women said they use seat belts, while 117 out of 180 men said the same. Test the claim that men are more safety conscious than women based one the use of seat belts at a 0.01 level of significance. Construct..
Find the standard deviation, rounding to the nearest tenth of a day. Interpret the standard deviation in context.
What is the purpose of inferential statistics? Provide an example of when you would use inferential statistics over descriptive statistics.
How do girls and boys differ in bullying behavior? What are some of the emotional consequences of being bullied
What will happen to my confidence level if I reduce my sample size due to budget cutbacks but wish to maintain the same level of precision
Suppose a national polling agency conducted 100 polls in a year, using proper random sampling, and reported a 95% confidence interval for each poll.- About how many of those confidence intervals would we expect not to cover the true population valu..
Predict final exam from midterm In an introductory statistics course, x = midterm exam score and y = final exam score. Both have mean = 80 and standard deviation = 10. The correlation between the exam scores is 0.70.
Take civil strife as the dependent variable. Compute the zero-order correlations among the three variables.
In a random sample of 500 families owning sets in the town was found that 340 subscribed to ASTRO. Find a 95% confidence interval for actual proportion of families in this town who subscribe to ASTRO.
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