Take for instance, the slow gait speed and the first category of activities associated with indoor falls. The point estimate of the RR is 2.44. Informally this means that when a person with a slow gait speed is transitioning/not moving, they are about 2.44 times more likely to fall than when a person with middle gait speed is transitioning/not moving. The confidence interval estimate for this RR is (1.45, 4.12). Since this confidence interval contains only values greater than 1, it appears that true value of this RR is greater than 1. We would conclude that there is a "statistically significant" difference between slow and middle gait speeds during this activity. Look over the other categories of activities associated with indoor falls. Does any other category appear to be significantly different for slow speed than for a middle speed? Explain why or why not. Repeat part a, but compare fast speed to middle speed. Repeat parts a and b, but look at outdoor falls

Here are summary statistics for randomly selected weights of newborn​ girls: nequals 235 ​, x overbar equals32.8   ​hg, sequals 7.9   hg. Construct a confidence interval estimate of the mean. Use a 99 ​% confidence level. Are these results very different from the confidence interval 29.7   hgless than muless than35.3   hg with only 15   sample​ values, x overbar equals32.5   ​hg, and sequals 3.6   ​hg? What is the confidence interval for the population mean mu ​?   nothing   hgless than muless thannothing   hg ​(Round to one decimal place as​ needed.) Are the results between the two confidence intervals very​ different?     A. ​No, because each confidence interval contains the mean of the other confidence interval.   B. ​Yes, because one confidence interval does not contain the mean of the other confidence interval.   C. ​No, because the confidence interval limits are similar.   D. ​Yes, because the confidence interval limits are not…

Suppose you compute a confidence interval with a sample size of 37. What will happen to the confidence interval if the sample size increases to 70?

A box model is used to calculate a confidence interval in the following scenario: Statistics club at TYHS wants to know the average time students in TYHS spent on preparing for their standardized exams. They sampled 100 students from TYHS. They want to construct a confidence interval for the average time that students in TYHS spent on preparing for their standardized exams. For each of the following quantities in the box model, select the answer if the quantity is random, not fixed. Leave the quantities that are fixed unselected. Group of answer choices. You can select more than one answer the proportion of 0's in the box model the EV and SE of the sample average the average time of every student in TYHS spent on preparing for their standardized exams the sample average of students spent on preparing for their standardized exams

orffout 3. In a survey conducted by the marketing agency 11mark, 241 of 1000 adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom (confessions included texting and answering phone calls). Construct a 96% confidence interval for the population proportion of adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom. Clearly state your results. BAIEŽ 12052 2002

If n=20, ¯xx¯(x-bar)=43, and s=10, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place.

The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 25 right handed students to turn a knob with their right hands that moved an indicator by screw action. There were two identical instruments, one with a right-hand thread and the other with a left-hand thread. The table given has the data from the student project.1. Calculate and interpret a 90% confidence interval for the mean time advantage of right hand over left hand threads in the setting above.

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Refer to Exercise 7. Someone suggests that the paired design be replaced with a design in which 18 cars are sampled, the lifetime of the front brakes is measured on 9 of them, and the lifetime of the rear brakes is measured on the other 9. A confidence interval for the difference between the means would then be constructed by using expression (5.21) (in Section 5.6). He claims that this design will produce a more precise confidence interval, since 18 cars will be used instead of 9. a) Will the new design produce a valid confidence interval? Explain. b) Is it likely that the confidence interval produced by the new design will be more precise than, less precise than, or about equally precise as the confidence interval produced by the paired design? Explain.

According to a poll, 82% of California adults (417 out of 506 surveyed) feel that education is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education is one of the top issues facing California.   1.Find the error bound. (Round your answer to three decimal places.)