A scientist wishes to estimate the average depth of a river. He wants to be 99% confident that the estimate is accurate within 2 feet. From a previous study, the standard deviation of the depths measured was 4.33 feet. How many samples does he need? Round off your answer to the nearest whole number.

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those…

A: given data, normal distribution , μ=100σ=15we have to find out the shaded region for the given…

Q: Find the Phat and q - hat for the given data, X = 258 and n = 564 Round to three decimals CS Scanned…

A: Answer:- Given, x = 258 and n = 564 Using formula,  P-hat = (x/n)  q-hat = (1 - P-hat)

Q: Illustration 11.20. Karl Pearson's coefficient of skewness of a distribution is +40. Its standard…

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Q: Answer D,E,F only. Thank you.

A: Box plot was used to measure the outlier in the data set. It is the graph that contain quartile…

Q: The average temperature in Anchorage, Alaska, in January is 21'F with a standard deviation of 10°.…

A: For Anchorage, μ=21σ=10 Consider, the probability that the temperature in a January with a high of…

Q: Suppose you select a sample of 2,000 high school seniors' verbal SAT scores. The mean and standard…

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Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: The level of calcium in the blood of healthy, young adults varies with a mean of 11.3 mg per…

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Q: A test for heart disease is given to 100,000 patients. The results of the test are shown in the…

A: False positive means healthy people who are identified as sick = 5600 True negative means healthy…

Q: Please calculate the SD of a sample of 11 data points using the formula taught in class.  The…

A: Sample size (n)= 11Sample mean The sum of all the scores squared It is required to calculate the…

Q: Illustration 10.7. Compute the standard deviation by the short method for the following data: 11,…

A: Data given  11,12,13,14,15,16,17,18,19,20,21

Q: You have seen that the larger the sample size, the smaller the sampling error tends to be in…

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Q: The tourist bureau of the Hawaiian Islands surveyed a sample of 5 United States tourists as they…

A: GIVEN DATA, sample size n=5sample:10,7,8,6,9standard deviation of the sample is =?

Q: A study collects samples of water from the tap in Vacaville and from bottled water available from…

A: The observed pH value is 6.32.The mean pH of Tap water is calculated as follows:

Q: a. Find the standard error comparing the sample means. Interpret. The standard error is se=

A: A recent study evaluated how addicted teenagers become to nicotine once they start smoking. The…

Q: I. For the following set of scores: 5 8 5 7 6 6 5 7 4 6 6 9 5 5 4 6 7 5 7 5 a. Place the scores in a…

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Q: What is the coefficient of variation of a data, which has a standart deviation 28 and mean as 400?…

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Q: Standard Deviation: A measure of the dispersion of a set of data from its mean. These are the steps…

A: Given temperature :  N=8 { 32,36,29,34,31,33,27,34 }  First we will calculate mean than we will…

Q: To assess the effect of a new golf ball and new driver on driving distance, I take repeated…

A: From the given information , it is clear that,     Old golf ball  New golf ball Old driver  88,…

Q: Xold = 78  M = 72   s = 15 Xnew= ?  M = 75   s = 10 What is the new raw score?

A: Solution-: Given: Xold=78,M=72,s=15            Xnew=?,M=75,s=10 We want to find new raw score=?…

Q: Provide an appropriate response. A doctor at a local hospital is interested in estimating the birth…

A: The confidence level is 90%, margin of error is 2 and the standard deviation is 7.

Q: er of yes answers on a questionnaire called the Hooked on ne Checklist (HONC). Of teenagers who had…

A: Sample sizes n1=141 ,n2=178Sample means x1=3.8 ,x2=2.4

Q: You sampled 20 students in a high school to try to predict the students' GPAs in 9th grade based on…

A:

Q: The Shake Out Earthquake Scenario is based on a magnitude 7.8 earthquake and serve as the basis for…

A: Given that the magnitude is 7.8 Mean is μ=2.5723 standard deviation, σ=0.6505

Q: Records at a hospital show that a certain surgical procedure takes and average 180.3 minutes with a…

A: The objective of this question is to find the range of values within which approximately 68% of the…

Q: A student takes a multiple-choice test that has 6 questions. Each question has four choices. student…

A: It is given that,  A student takes a multiple-choice test that has 6 questions i.e. n=6 Each…

Q: Suppose a random sample of 5804 physicians in Colorado showed that 3145 provided at least some…

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Q: Note: Solve the following problems. Show all solutions. Round off final answers to 3 decimal places.…

A: Given that.   X~N( μ , ?)   μ=280     , ?=60   Z-score =( x - μ )/?

Q: An adult rabbit's average length is 30cm, with a standard deviation of 4cm. How many percent of…

A: Given that  μ = 30 , ? = 4

Q: Please circle your answers. Thank you in advanced!

A: Part a: The variable under study is the increment in weight (pounds), so the level of measurement…

Q: Determine the critical value of the chi square statistic for alpha = 0.05 with 30 degrees of freedom

A: Degrees of freedom = 30 α = 0.05

Q: Percentage of 18-to 24-year olds living in parents' homes Refer to the figure at the right. At a =…

A: For the given data perform z test for two proportion test

Q: 10

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Q: Identify the level of measurement of the data , and explain what is wrong with the given…

A: Nominal: The level of measurement is nominal when the observations are defined in terms of…

Q: Smith works as a welder inspector in a shipyard. He knows from keeping track of good and poor welds…

A: Let p denote the propprtion of poor welds. Given that p = 5% = 0.05 Sample size n = 300