b)
z =-1.21
c)
d)
e)
P(type I error )=P(Xbar <72.37)=P(Z<(72.37-76)*sqrt(100)/7)=P(Z<-5.19)=0.0000
My Notes Ask Your Consider a paint-drying situation in which drying time for a test specimen...
My Netes Ask Your Consider a paint-drying situation in which drying time for a test specimen is normally distributed with ? 6. The hypotheses Ho: 74 and Hai < 74 are to be tested using a random sample of n 25 observations. (a) How many standard deviations (of X) below the null value is x 72.3? (Round your answer to two decimal places.) standard deviations (b) If x-72.3, what is the conclusion using a-0.01? (Round your answers to two decimal...
Consider a paint-drying situation in which dying time for a test specimen is normally distributed with σ sample of n 25 observations 75 are to be tested using a random 7. The hypotheses Ho μ-75 and Ha μ (a) How many standard deviations (of x) below the null value is x 72.3? (Round your answer to two decimal places.) 1.93 standard deviations (b) Ifx 72.3, what is the conclusion using a 0.0047 Calculate the test statistic and determine the P-value....
Consider a pa nt drying situation In which drying time or a test spec n-25 observations. en Is normally distributed with o 6 TI e ypotheses 0: ·74 and μく are to be tested using aan om sample of (a) How many standard devlations (of X) below the null value is x 72.3? (Round your answer to two declmal places.) 1.42 standard deviations (b) If x = 72.3, what is the conclusion using α-0.0067 Calculate the test statistic and detrmine...
73 and 73 are to be tested using a random sample Consider a part-drying situation in which drying time for a test specimen is normally distributed with . The hypotheses o of n - 25 observations (a) How many standard deviations (of x below the null value is x 72.37 (Round your answer to two decimal places.) standard deviations (b) If x= 72.3, what is the conclusion using a = 0.0057 Calculate the test statistic and determine the value. (Round...
The drying time of a certain type of paint under specified test conditions is known to be normally distributed with mean value 75 min and standard deviation 9 min. Chemists have proposed a new additive designed to decrease average drying time. It is believed that drying times with this additive will remain normally distributed with σ = 9. Because of the expense associated with the additive, evidence should strongly suggest an improvement in average drying time before such a conclusion...
Consider the following hypothesis test. Ha: μ < 50 A sample of 36 is used. Identify the p-value and state your conclusion for each of the following sample results. Use -0.01. X (a) 49 and s-5.2 Find the value of the test statistic. (Round your answer to three decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value State your conclusion. Do not reject Ho There is insufficient evidence to conclude that u 50 O Reject Ho....
44. You may need to use the appropriate technology to answer this question. Consider the follovring hypothesis test. A sample of 36 is used. Identify the p-value and state your conclusion for each of the following sample results. Use α = 0.01. (a)x44 and s5.1 Find the value of the test statistic. (Round your ansvwer to three decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value State your conclusion. O Do not reject Ho. There is...
The desired percentage of SiO2 in a certain type of aluminous cement is 5.5. To test whether the true average percentage is 5.5 for a particular production facility, 16 independently obtained samples are analyzed. Suppose that the percentage of SiO2 in a sample is normally distributed with σ = 0.30 and that x= 5.23. (Use α-0.05.) (a) Does this indicate conclusively that the true average percentage differs from 5.5? State the appropriate null and alternative hypotheses Hai μ < 5.5...
The paint used to make lines on roads must reflect enough light to be clearly visible at night. Let μ denote the true average reflectometer reading for a new type of paint under consideration A test of Ho: μ 20 versus Ha: μ > 20 will be based on a random sample of size n from a normal population distribution. What conclusion is appropriate in each of the following situations? (Round your P-values to three decimal places.) (a) z3.3, a-0.05...
The desired percentage of SiO2 in a certain type of aluminous cement is 5.5. To test whether the true average percentage is 5.5 for a particular production facility, 16 independently obtained samples are analyzed. Suppose that the percentage of SiO2 in a sample is normally distributed with σ = 0.32 and that x = 5.22. (Use α = 0.05.) (a) Does this indicate conclusively that the true average percentage differs from 5.5? State the appropriate null and alternative hypotheses. H0:...