Mathematics, 04.09.2019 02:30 ZBSJ
Most dermatologists recommend using sunscreens that have a sun protection factor (spf) of at least 30. one of the authors wanted to find out whether the spf of sunscreens used by students at her school exceeds this value on average? to collect data, the author surveyed students in her introductory statistics course and found that in a sample of 52 students the mean spf was 34.55 and the standard deviation of spf was 20.12. the data were not strongly skewed. use the theory-based inference applet to find and report the 95% confidence interval for the parameter of interest. round answers to 4 decimal places, e. g. 0.7523. we are 95% confident that the mean spf level of sunscreen used by all cal poly students is between and .
Answers: 3
Mathematics, 21.06.2019 22:00
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The perimeter of â–łcde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.
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Mathematics, 22.06.2019 04:40
A. 15 degrees b. 45 degrees c. 30 degrees d. 60 degrees
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