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One day, you notice your 6' 2" roommate's size 12 shoes and comment, "I think height and foot size are correlated". You're somewhat surprised (and irked) by his response, "I think short people have big mouths." You decide to test your hypothesis; you find five people and record their heights (in inches) and shoe sizes. Calculate a Pearson r based on the following data:
Person Shoe Size Height
1 12 74
2 8 62
3 10 73
4 9 64
5 9½ 65
What symbol is used to represent the mean of the sampling distribution of y-(ybar)? Explain and what symbol is used to represent one value from the sampling distribution of y-(ybar)? Explain
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
If there are 500 students in the school, what is the probability that everyone will pass the exam
First, write down three social problems (e.g., drug abuse, gang membership, bullying, domestic violence, child abuse, etc) that we might attempt to predict using logistical regression.
To get the best deal for CD player, Jessica called eight appliance stores and asked the cast of a specific model. The prices she quoted are listed below. Show all work. Compute the standard deviation.
Explain how much should the airport authority be willing to pay for perfect information about the success of a brand new airport.
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years.
What type of error would result in that case? Respond to at least two of your classmate's postings.
When we have data that are measured at the interval/ratio level of measurement, there are:
With 95% confidence, what is the margin of error (to 2 decimals)? What is the 95% confidence interval estimate of the population mean?
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