a random sample of 10 steel rods from this manu_fac_ture, the ten_sile stren_gths of at le_ast two st_eel ro_ds are over 430 MPa
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The tensile st_ren_gth of a certain type of st_e_el rods produ_ced from a certain manu_facturer
is
that, in a random sample of 10 steel rods from this manu_fac_ture, the ten_sile stren_gths of at le_ast two st_eel ro_ds are over 430 MPa?
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- A study of sizes of metastatic carcinoid tumors in the heart was conducted. Based on that study, we assume that Page 2 of 2lengths of metastatic carcinoid tumors in the heart are normally distributed with mean 1.8 cm and standarddeviation 0.5 cm. Determine the percentage of metastatic carcinoid tumors in the heart that (7 Marks)a). are between 1 cm and 2 cm long.b). exceed 3 cm in length.Find the expected frequency for each cell. Compare the observed and expected frequencies for each cell. Compute 2^STAT • Is it significant at a = 0.01?In 2017, the entire fleet of light‑duty vehicles sold in the United States by each manufacturer must emit an average of no more than 9090 milligrams per mile (mg/mi) of nitrogen oxides (NOX) and nonmethane organic gas (NMOG) over the useful life (150,000150,000 miles of driving) of the vehicle. NOX ++ NMOG emissions over the useful life for one car model vary Normally with mean 8484 mg/mi and standard deviation 66 mg/mi. (a) What is the probability that a single car of this model emits more than 9090 mg/mi of NOX ++ NMOG? (Enter your answer rounded to four decimal places.) (b) A company has 1616 cars of this model in its fleet. What is the probability that the average NOX ++ NMOG level ?¯x¯ of these cars is above 9090 mg/mi? (Enter your answer rounded to four decimal places.)
- The bearing for any computer hard drive can be modeled as a random variable with mean 0.225 mm and variance of 1.764x10 ^ -5 mm ^ 2.The mean bearing of sample X will be obtained from a random sample of 40 discs.What is the probability that X will fall between 0.2245 and 0.226 mm?in a recent year , the mean number of strokes per hole for a famous golfer was approximalety 3.6 A.) find the variance and standard deviation using the fact that the variance of a possion distribution is o^2=u b) how likely is this golfer to play an 18-hole round and have more than 72 strokes?Explain The J-statistic under homoskedasticity?
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- In å random sample of 600 persons from a certaian large city, 450 are found to be smokers. In one of 9c0 from another large city. 450 are smokers. Do the data indicate that the cities are significantly dlfferent with respect to the prevalence of smoking.Find the probability that a random sample of 25 observations, from a normal population with variance o^2=6, has sample variance: greater than 9.1In a random sample of size 58, 29 people say they generally get less than 8 hours of sleep a night. Calculate the point estimates ˆpp^ and ˆqq^.
