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It has been found from past experience that of the articles produced by a factory, 20% come from machine 1, 30% come from machine 2 and 50% come from machine 3. The percentages of satisfactory articles among those produced are 95% for machine 1, 85% for machine 2 and 90% for machine 3.
(a) An article is chosen at random from a lot. What is the probability that it is satisfactory ?
(b) Assuming that it is satisfactory, what is the probability that it was produced by machine 1 ?
To test the hypothesis that there is no association between use of postmenopausal hormones and risk of MI, chi-square statistics need to be calculated.
A researcher has been hired by a pizzeria to determine which type of crust customers prefer. The restaurant offers three types of crust: hand-tossed, thick, and thin. Following are the mean number of 1-inch pieces of pizza eaten for each condition fr..
The ages (in years) of the employees at a particular computer store are 36, 32, 22, 32, 33 . Assuming that these ages constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal plac..
A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service. The company has been able to provide its customers with a ..
What would be your answer if emergencies are twice as likely to arise in the northern two-mile stretch than in the southern two-mile stretch (but are uniformly distributed within each two-mile stretch)? Find the numerical solution to this part..
1.An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 20 metal sheets are given below. Use the simple linear regression model. ∑X = 40 ∑X2 = 200 ∑Y = 70 ∑Y2 = 545 ∑XY = 3..
Suppose that 30 people have been asked in a survey about how many hours they spend watching TV per day. Then, use these data to find a 95% confidence interval for the mean amount of time spent watching TV is 1.5 to 3.2 hours. Which statement is NOT t..
What is the coefficient of correlation"r"? Do you think this "r" value suggests a strong correlation among the predictors ( the independent variables?
Consider a machine that fills soda bottles.
Explain the assumptions underlying the two-sample test of means.When can one assume normality for two proportions?
Unions often oppose imports from what they call low-wage countries and advocate trade barriers to protect jobs from what they often characterise as "unfair" import competition" please critically analise this statement
You are proposed to accept or reject a lottery which gives X with probability 1/3 and -1 with probability 2/3. Before accepting you receive a signal "g" (good) or "b" (bad). The signal has precision q=P(g|win)=P(b|lose)>1/2.
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