Determine the 95% confidence interval for the true process cp if a sample of size n = s = 0.0042 and the spec is USL/LSL 1.500 ± 0.020. 80 gives
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- What is tα/2,df for a 95% confidence interval of the population mean based on a sample of 15 observations?Find the critical values χ21−α/2 and χ2α/2 for a 80% confidence level and a sample size of n=25.A random sample of 35 observations is taken from a population with unknown mean u and known standard deviation sigma theta = 8 If the mean of the sample %3D is 17.2. Find 90% confidence interval for the population mean beta.
- The melting points of two alloys used in formulating solder were investigated by melting 21 samples of each material. The sample mean and standard deviation for alloy 1 was īi = 420°F and si = T2 = 426°F and s2 = 3°F. Find a 95% confidence interval on the difference in 4°F , and for alloy 2, they were %3D the two means. (-0.061, 0.861) -4.119, 15.129) (-8.205, –3.795) (1.857, 18.943)Find the t-critical value (?(?/2)) for a 70% confidence interval with a sample size of 15.A 95% confidence interval for the mean was computed with a sample of size 90 to be (16,22). Then the Error is ±3.
- Find a 95% confidence interval for the sample mean of Y = X̄12 + X̄22 when X̄'s are obtained from standart normal population.A 95% confidence interval for the mean was computed with a sample of size 100 to be (10,14). Then the Error is ±2. true or falseConcentration of atmospheric pollutants such as carbon monoxide (CO) can be measured with a spectrophotometer. In a calibration test, 50 measurements were taken of laboratory gas sample that is known to have a CO concentration of 70 ppm. A measurement is considered to be satisfactory if it is within 5 ppm of the true concentration. Of the 50 measurements, 37 were satisfactory. Find a 95 % confidence interval for the proportion of measurements made by this instrument that will be satisfactory. How many measurements must be taken to specify the proportion of satisfactory measurements to within+0.10 with 95% confidence?
- The mean score of a random sample of 35 Grade 11 students who took the first periodic test iscalculated to be 86. The population variance is known to be 0.10.A sample of size n=11 has a sample mean xbar=15.6 and sample standard deviation s=2.4 Construct a 95% confidence interval for the population mean μ.If a random sample of size n = 20 from a normal population with the variance o = 25 has the mean F = 64.3, construct a 95% confidence interval for the population mean H. %3D %3D