Use the Normal model N(102,10) for the IQs of sample participants. a) What IQ represents the 11th percentile? b) What IQ represents the 90th percentile? c) What's the IQR of the IQs?

Please do all the questions

Suppose researchers want to investigate if experiencing mother nature more often reduces a person's blood pressure. They define the response variable to be blood pressure (systolic), and the explanatory variable to be how many hours, on average, someone spends outdoors each day. A. Could the researchers conduct a randomized experiment to test this? Explain briefly. b. Say an observational study was conducted, and it was found that the people who spend more time outdoors tended to have lower blood pressure. B. Could this be used to conclude that spending time outdoors causes blood pressure to decrease? Explain briefly. C. In a few sentences, discuss why the number of miles (on average) someone jogs each day could be a possible confounder. For questions, 3-6 refer to the MedGPA.txt dataset on the class website. The MCAT (medical college admission test) is a test that is taken by students who want to attend medical school in the USA. The description of each variable in this dataset is as…

20 computer screens were randomly selected from a large collection of computer screens in a company’s warehouse. These 20 computer screens are referred to as the: test statistic. parameter. population. sample.

A software company is interested in improving customer satisfaction rate from the 66% currently claimed. The company sponsored a survey of 280 customers and found that 199 customers were satisfied. What is the test statistic z? Ex: 2.22 3

Sixty-three college men were asked what they thought was their ideal weight. A five-number summary of the responses (in pounds) follows. Median 176 Quartiles 155 200 Extremes 122 233 About what percent of the men gave a response that falls in the interval 155 to 176 pounds? % give an exact answer

What is percentile rank of 20?. Please answer correctly.

Data was collected for 322 randomly selected 10 minute intervals. For each ten-minute interval, the number of people entering the atrium of a large mall were recorded. The data is summarized in the table below. Number  of Guests      Frequency    220 – 224 98 225 – 229 81 230 – 234 36 235 – 239 63 240 – 244 44 What is the class width for this GFDT?Class width =

Mistake A clerk entering salary data into a companyspreadsheet accidentally put an extra “0” in the boss’ssalary, listing it as $2,000,000 instead of $200,000. Explain how this error will affect these summary statis-tics for the company payroll: a) measures of center: median and mean.b) measures of spread: range, IQR, and standarddeviation.

The 2008 general social survey asked a nationally representative sample of 1324 adult americans to report how many hours of television they watch in a typical day. The resulting data are reported in the following table counts. What is the mean numbers of hours of tv watched?