ind the 95% confidence interval of the true mean of the noise levels in the operating rooms.
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Hospital Noise Levels For a sample of 7 operating rooms taken in a hospital study, the
decibels and the standard deviation was 11.4. Find the 95% confidence interval of the true mean of the noise levels in the operating rooms. Assume the variable is
___< means< ___
|
<<μ
|
|
It is given that
Sample mean = 42
Sample std. deviation = 11.4
Sample size = 7
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- nterstate Speeds It has been reported that the standard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 29 drivers the standard deviation is 9.1 miles per hour. At =α0.05, is the driver correct? Assume the variable is normally di) Find the critical value(s). Round the answers to three decimal places, if necessary. If there is more than one critical value, separate them with commas.se the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2.Samples of size 115 from Population 1 with mean 83 and standard deviation 14 and samples of size 90 from Population 2 with mean 79 and standard deviation 18Round your answer for the standard error to two decimal places.standard error =The Z-score tells you the number of standard deviations away from the mean (and X-μ can be used to find the in what direction) a data value is. The formula: Z Z-score for a single member of the population. Notice X - μ tells you the signed distance the data value (X) is from the mean. When you divide that by the size of each chunk (the standard deviation) you are measuring the distance in units of the size of the standard deviations (how many standard deviations fit in the distance between the data value and the mean) - which gives you the Z-score. σ The formula X = μ+Z. can be used to find the value in the population when given the Z-score (signed number of standard deviations). Notice that Z. tells you how far from the mean the data value is (since Z is the number of standard deviations and is the size of each standard deviation the product tells the total distance). So adding the distance from the mean to the mean gives the location along the number line for the data value. A…
- The mean is 146 and the standard deviation is 35. A score of 41 is how many z-scores below the mean?A normal population has mean =μ9 and standard deviation =σ5 . Find the proportion of the population that is greater than 4 . Round the answers to at least four decimal places. The proportion of the population that is greater than 4 is .The variance and the standard deviation are related by the fact that the square root of the variance is equal to the standard deviation. Suppose the variance of the time it takes to complete a bachelor's degree is 0.8. Find the standard deviation. Round your answer to four decimal places.
- Interstate Speeds It has been reported that the standard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 29 drivers the standard deviation is 9.1 miles per hour. At =α0.05, is the driver correct? Assume the variable is normally distributed. (a)State the hypotheses and identify the claim with the correct hypothesis.Help me plzzThe regression line for Y vs X is given by Y = 0.82X + 59.1. The standard deviations for X and Y are 1.5 and 2.2 respectively. Suppose now we construct a regression line that uses Y to predict X. The predicted average increase of X when Y is increased by 1 unit is ______________. (Give your answer correct to 2 decimal places.)
