If four healthy adults are randomly selected, find the probability that their mean 25-OHD level is adequate (above 50 nmol/L).
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- Find the mean hourly cost when the cell phone described above is used for 240 minutes.Suppose that a random sample of 390 U.S. advertising agencies gives a percentage share of billing volume from network television equal to 0.48. Calculate a 95 percent confidempe interval for the mean percentage share of billing volume from network television for the population of all U.S. advertising agencies. (Round your answers to 4 decimal places when making computations)correct normal distribution notation 1. X~N(93.25,13.^1) 2. X~N(93.25,14.^4) 3.X~N(93.25,3.6^2) 4. X~N(93.25,3.7^2)
- As the director of a research laboratory you are paid to decide if there is a significantdifference between the mean values of two sets of data obtained by two different scientists, asenior scientist and one recently hired. Use 95% CL. (t at df = 10 is 2.23)• Data of Senior Scientist: x mean = 24.66% with s = 0.06% for n = 5• Data of the New Kid: x mean = 24.55% with s = 0.10% for n = 7· A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the drug company is currently producing has a normal distribution with an average of 7.4 minutes with a standard devia- tion of 1.2 minutes. The chemistry of the new anesthetic is such that the effective time sho- uld be normal with the same standard devia- tion, but the mean effective time may be lo- wer. If it is lower, the drug company will market the new anesthetic; otherwise, they will continue to produce the older one. A sam- ple of size 36 results in a sample mean of 7.1. A hypothesis test will be done to help make the decision. Test hypothesis in level of significance = 0.10Multiple Choice. Choose the letter of the correct answer. Write the letter of your answer before the number (2pts.) I. 1. This is the single value used to represent the parameter interest. a. Interval estimate
- The lifespan of a certain light bulb in (hours) is a Normal model of (400,10) What do the standard deviation and mean describe a light bulb lifespan.The number of Btu's of petroleum and petroleum products used per person in the united states in 1975 was normally distributed with mean 153 million Btu's and standard deviation 25 million Btu's. Approximately what percentage of the population used between 128 and 178 million Btu's during that year? Approximately what percentage of the population used in excess of 228 million Btu's?baby buster - Google Search .edu/webapps/assessment/take/launch.jsp?course_assessment_id=_804647_18&course_id%3_172595 1&content_id%3_15517779... ☆ Question Completion Status: QUESTION 6 A bakery makes brownies in batches of 72 and there is a 3.3% rate of defects. Find the mean number of defects per batch. Round your answer to the nearest thousandths place.
- Let (x-bar) be the mean of a random sample of size 60 drawn from a population with mean 120 and standard deviation 45. Determine the standard error of the meanFind the area of the shaded region.The mean weekly wages of workers are with S.D. of rupees 4. A sample of 625 is selected, find the standard error of the mean and probable error.