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Define parameters and state the null and alternative hypotheses: In 2013, it is known that two-thirds (about 67%) of people aged 50-64 were on Facebook. Pew Research tracks this trend in their annual survey. In 2018, they randomly sampled 500 people aged 50 - 64 and recorded that 315 people use Facebook. Test whether the trend has increased from 2013 at α = 0.05.
a computer laboratory manager was in charge of purchasing new battery packs for her lab of laptop computers. she
Question: The logistic equation is commonly used to model growth phenomena in biological populations:
What is the probability that a consumer selected at random: a. purchased fewer products than before? b. purchased the same number of products as before?
1. Three different fertilizers are to be applied to ?ve bushes each for three varieties of ?ower plants: gardenia (G), rose (R), and jasmine (J). Create a randomized complete block design. Choose as blocks the different types of plants (G, R, or J..
A sample proportion is calculated from a sample size of 394. How large of a sample would we need in order to decrease the standard error by a factor of 9?
Biology and Environment Science- Is there any evidence that the mean CO2 emissions has decreased? Assume σ = 65 and use a = 0.05. Write a Solution Trail for this problem.
There is some concern that exposure to gases used in anesthesiology might be harming health of anesthesiologists. In one study of 525 Michigan nurse anesthesiologists, 10 reported a new malignancy other than skin cancer during the previous year.
the standard deviation of the lifetime of a sample of 15 electric light bulbs was computed to be 98 hours and the
The average stock price for companies making up the S&P 500 is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. What is the probability a company will have a stock price less than $33.
The size of an atom is approximately 10-8 cm. To locate an electron within the atom, one should use electromagnetic radiation of wavelength not longer than 10-9 cm. What is the energy of the photon with such a wavelength (in cV)?
The following table is based on information taken from the Medical Practice Characteristics section of the Statistical Abstract of the United States
Refer to the CDI data set in Appendix C2 and Project 19.53. The metropolitan areas identified in Project 19.53 are to be considered in a study of the effects of region (factor A: variable 17) and percent below poverty level (factor B: variable 13) ..
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