Give a 90% confidence interval, for μ1−μ2 given the following information. n1=25 ¯x1=2.22, s1=0.71 n2=35, ¯x2=2.52, s2=0.5 ± Use Technology Rounded to 2 decimal places.
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Q: Give a 90% confidence interval, for μ1−μ2 given the following information. n1=35 ¯x1=2.45, s1=0.71…
A: Givenn1=35 x1 = 2.45 s1=0.71n2=45 x2 = 2.14 s2=0.97
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A: Given: n1=25,x1=2.37, s1=0.9n2=45, x2=2.52 s2=0.75
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Give a 90% confidence interval, for μ1−μ2 given the following information.
n1=25 ¯x1=2.22, s1=0.71
n2=35, ¯x2=2.52, s2=0.5
± Use Technology Rounded to 2 decimal places.
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- A random sample of CO2 levels in a school has a sample mean of x¯=598.4 ppm and sample standard deviation of s=86.7 ppm. Use the Empirical Rule to determine the approximate percentage of CO2 levels that lie between 338.3 and 858.5 ppm.In this exercise you will determine how many data values you’ll need to collect so that the true voltage is within the given variation from the collected data average, i.e. the true voltage is within the interval ± given variation, with a given level of confidence. Suppose you desire the true voltage to be within 0.01V of the collected data average with 90% confidence, i.e. Set p = 0.9 Determine α/2 = (1 - p)/2Do reverse lookup in a Z table, or use Excel function NORM.INV(0.95,0,1). Also, you must have a value for σ, the population standard deviation. For this question, assume it is 0.028. Next, rearrange the equation to solve for N.The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with population mean 14 for healthy adult women. Suppose a female patient has had 14 laboratory blood tests during the past year. Her average HC is 14.84 with s = 2.4. Is there evidence that her average HC is not 14? (a) State the null and alternative hypotheses: (Type "mu" for the symbol μμ , e.g. mu >> 1 for the mean is greater than 1, mu << 1 for the mean is less than 1, mu not = 1 for the mean is not equal to 1)H0H0 : HaHa : (b) Find the test statistic, t = (c) Answer the question: Is there evidence that her average HC is not 14? (Use a 1% level of significance)(Type: Yes or No)
- Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 36 tests gave a sample mean of x = 6.7 ppb arsenic, with s = 3.0 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01. n USE SALT (a) What is the level of significance? State the null and alternate hypotheses. O Ho: H = 8 ppb; H,: u > 8 ppb O Ho: H = 8 ppb; H,: H + 8 ppb O Ho: H 8 ppb; H,: u = 8 ppb O Ho: H = 8 ppb; H,: µ 0.100 O 0.050 < P-value < 0.100 O 0.010 < P-value < 0.050 O 0.005 < P-value < 0.010 P-value < 0.005 Sketch the sampling distribution and show the area corresponding to the P-value. MacBook Pro escA population of score has μ = 90. In this population, a score of X = 100 correponds to z = 5. what is the population standard deviation?The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with population mean 14 for healthy adult women. Suppose a female patient has had 18 laboratory blood tests during the past year. Her average HC is 16.83 with s = 0.76. Is there evidence that her average HC is not 14? (a) State the null and alternative hypotheses: (Type "mu" for the symbol μ , e.g. mu > 1 for the mean is greater than 1, mu < 1 for the mean is less than 1, mu not = 1 for the mean is not equal to 1)H0: Ha: (b) Find the test statistic (give to at least 3 decimal places), t = (c) Answer the question: Is there evidence that her average HC is not 14? (Use a 1% level of significance)(Type: Yes or No)
- The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with population mean 14 for healthy adult women. Suppose a female patient has had 16 laboratory blood tests during the past year. Her average HC is 16.94 with s = 1.05. Is %3D there evidence that her average HC is not 14? (a) State the null and alternative hypotheses: (Type "mu" for the symbol u, e.g. mu >1 for the mean is greater than 1, mu <1 for the mean is less than 1, mu not = 1 for the mean is not equal to 1) Ho : На (b) Find the test statistic (give to at least 3 decimal places), t =The average wind speed in Casper Wyoming has been found to 12.7 miles per hour and in Phoenix Arizona it is 6.2 mph. To test the relationship between the averages, the average wind speed has calculated for a sample of 31 days for each city. The results are reported below. Is there sufficient evidence at alpha = 0.05 to conclude that the average wind speed is greater in Casper or Phoenix ? Sample size Casper 31 Phoneix 31 Sample mean 12.85mph 7.9mph Sample standard deviation 3.3mph 2.8mphUnfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 36 tests gave a sample mean of x = 7.1 ppb arsenic, with s = 2.2 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01. A USE SALT (a) What is the level of significance? State the null and alternate hypotheses. O Ho: H= 8 ppb; H,: H > 8 ppb O Ho: H 8 ppb; H: H = 8 ppb (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. O The standard normal, since the sample size is large and a is unknown. O The Student's t, since the sample size is large and a is known. O The standard normal, since the sample size is large and a is known. O The Student's t, since the sample size is large and a is unknown. What is…
- Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 36 tests gave a sample mean of x = 7.1 ppb arsenic, with s = 2.2 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01. A USE SALT (a) What is the level of significance? State the null and alternate hypotheses. O Họ: u = 8 ppb; H,: u > 8 ppb O Ho: H 8 ppb; H,: u = 8 ppb (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. The standard normal, since the sample size is large and a is unknown. O The Student's t, since the sample size is large and a is known. O The standard normal, since the sample size is large and a is known. The Student's t, since the sample size is large and a is unknown. What is the…The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with population mean 14 for healthy adult women. Suppose a female patient has had 19 laboratory blood tests during the past year. Her average HC is 13.49 with s = 2.48. Is there evidence that her average HC is not 14? (a) State the null and alternative hypotheses: (Type "mu" for the symbol μ� , e.g. mu >> 1 for the mean is greater than 1, mu << 1 for the mean is less than 1, mu not = 1 for the mean is not equal to 1)H0�0 : equation editor Equation Editor Ha�� : equation editor Equation Editor (b) Find the test statistic (give to at least 3 decimal places), t = equation editor Equation Editor (c) Answer the question: Is there evidence that her average HC is not 14? (Use a 1% level of significance)(Type: Yes or No)The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with population mean 14 for healthy adult women. Suppose a female patient has had 8 laboratory blood tests during the past year. Her average HC is 13.45 with s = 2.22. Is there evidence that her average HC is not 14? (a) State the null and alternative hypotheses: (Type "mu" for the symbol μ, e.g. mu> 1 for the mean is greater than 1, mu < 1 for the mean is less than 1, mu not = 1 for the mean is not equal to 1) Но : H₁: (b) Find the test statistic (c) Answer the question: Is there evidence that her average HC is not 14? (Use a 1% level of significance) (Type: Yes or No)