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A manufacturer of car batteries claims that the distribution of the life spans of its best battery has mean 54 months and standard deviation 6 months. A consumer group purchases a random sample of 50 u8batteries and tests the battery life spans. The sample mean lifespan is 52 months.
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
Pollsters try to determine whether or not a person is a "likely voter" before they count their opinion in a poll. If we assume 40% of the registered voters will actually vote, in a random sample of 100 registered voters we can be 95% confident tha..
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location.
Based on the sample findings, estimate the true mean of Saturday sales with 90% probability.
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
Suppose a t- test is being applied to find out if the population monthly expenditure mean is less than $212. The level of significance selected is 1% and 26 accounts are sampled. What is the critical value?
A random sample of 1001 University of California faculty members taken in December 1995 was asked, "Do you favor or oppose using race, religion, sex, color, ethnicity or national origin as a criterion for admission to the University of California?
Cast a die a number of independent times until a six appears on the up side of the die. Find the probability density function F(x)= P(X
Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1,150
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
A psychologist determined that the number of sessions required to obtain the trust of a new patient is 1, 2, and 3. Let x be the random variable indicating the number of sessions required to gain the patient's trust. The following probability fu..
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
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