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In a recent study of 35 ninth-grade students, the mean number of hours per week that they played video games was 16.6. The standard deviation of the population was 2.8. a. Find the best point of estimate of the population mean b. Find the 95% confidence level of the mean of the time playing video games c. Find the 99% confidence interval of the mean time playing video games d. Which is larger? Explain why.
A telescope manufacturer wants its telescopes to have standard deviations in resolution to be significantly below 2 when focusing on objects 500 light-years away. When a telescope is used to focus on an object 500 light years away 30 times,
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion.
Taking α to be 0.05, what is/are the critical values associated with testing your hypothesis?
a college requires applicants to have an act score in the top 10 of all test scores. the act scores are normally
the blood pressure measurements of a single patient were taken by twelve different medical student and the results are
an insurance company found that 2.5of male drivers between theages of 18 and25 are involved in serious accidents
In a study of 10 graduate students from a nurse education program, the average age of the group was 48.6 years and the standard deviation was 4.1 years. Assume the variable is normally distributed. Find the 95% confidence interval of the true mean..
The probability that husband and wife will b alive after 20 years from now is 0.8 and 0.9 respectively.find the probability that in 20 years time 1. both will b alive 2. neither of them will b alive 3. atleast one of them will be alive?
Suppose that in NY State, 35% of voters are Democrats, 30% are Republicans, and 11% are independent. You are conducting a poll by randomly calling registered voters. In your first four calls, what is the probability that you talk to:
suppose that y1 y2 . . . yn denote a random sample from an exponentially distributed population with mean?find the mle
A random sample of 8 petrol stations in each of three European countries A, B and C was taken. The price per litre at each station was recorded in Euros. The prices are given below.
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