What critical value t* should be used when constructing a 99.8% confidence interval for u using a SRS of size 96?
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- What value of zα/2 is used in confidence interval shown below?What value of z-alpha/2 is used in a 90% confidence interval for the population mean?The mean change in muscle thickness observed after a 4-week training regimen was 4 mm, and the 95% confidence interval (CI) for mean change was (-0.5, 8.5). Which is the best scientific conclusion for the effectiveness of this regimen ?
- Find a 90% confidence interval of mean chloride concentration when roadway area is 0.8% write your solution clearlyWhat critical value of t* should be used for a 95% confidence interval for the population mean based on a random sample of 21 observations? Find the t-table here. t* = 1.721 t* = 1.725 t* = 2.080 t* = 2.086What critical value t∗ should be used when constructing a 98% confidence interval for μ using a SRS of size 96?
- Dr. Moore wanted to estimate the mean cholesterol level for all adult men living in Hartford. He took a sample of 25 adult men from Hartford and found that the mean cholesterol level for this sample is 186 mg/dL with a standard deviation of 12 mg/dL. Assume that the cho- lesterol levels for all adult men in Hartford are (approximately) normally distributed. Con- struct a 95% confidence interval for the population mean u.What is the talpha/2 value to use for calculating a confidence interval from a sample of size 45 when a 90% confidence interval is desired?The number of cell phones per 100 residents in countries in Europe is given in table #9.3.9 for the year 2010. The number of cell phones per 100 residents in countries of the Americas is given in table #9.3.10 also for the year 2010 ("Population reference bureau," 2013). Find the 98% confidence interval for the different in mean number of cell phones per 100 residents in Europe and the Americas. (Show all work) Table #9.3.9: Number of Cell Phones per 100 Residents in Europe 100 100 76 100 130 75 84 112 112 84 138 133 118 134 126 126 188 129 93 64 128 124 124 122 109 121 127 152 96 96 63 99 95 151 147 123 123 95 67 67 118 125 110 110 115 140 115 141 77 98 98 102 102 112 118 118 54 54 23 121 126 47 Table #9.3.10: Number of Cell Phones per 100 Residents in the Americas 158 117 106 159 53 50 78 66 88 92 42 3…
- Find a 95% confidence interval of mean chloride concentration when roadway area is 1.0%A survey of 38 families found that their newborn child used an average of X=3,796 diapers in their first year with a sample standard deviation of s=123. What critical value should be used to find a 95% confidence interval for the population mean?You have an SRS of 23 observations from a normally distributed population. What critical valueshould you use to obtain a 98% confidence interval for the mean (u) of the population if thepopulation’s standard deviation (o) is unknown?