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Q1) A business wishes to evaluate true mean annual income of its customers. It randomly samples 200 of its customers. Mean annual income was= $52,500 with standard deviation of $1,800. Determine a 95% confidence interval for true mean annual income of business' customers.
Q2) In standard normal distribution mean is always ___
a) None of these
b) 1
c) 2
d) 0
Q3) Area under standard normal curve is
b)1
c) 0
d) 2
Q4) What is critical z-value which corresponds to confidence level of 88%
a) Approximately1.75
b) Approximately1.55
c) Approximately1.48
d)Approximately2.11
Q5) Interpret 95% confidence interval of (3.355, 3.445) for population mean.
Q6) In normal distribution with mu = 25 and sigma = 3 what number corresponds to z = -3?
A) 20
B) 16
C) 18
D) None of these
Find the confidence interval for the mean price, μ, of all dealer sticker prices of new cars: for a confidence level of 90% in thousands of dollars:
Open data file on your excel file AirlinePassengers . Point to the level of data (nominal, ordinal, ratio, or interval) measurement for each variable in data set. Notice tab for description gives information about data.
An advisory group decided to investigate this claim, believing it was too large. A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the 0.01 significance level. Show..
Given that the student you choose is a senior, find out the probability of selecting a non-senior?
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
compute the expected value and variance of U.Determine Expected value and variance using uniform distribution.
If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.
What is the probability that at most five cases of E. coli per 100,000 are reported in California this year?
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
What is the probability she received 5 or more email during the same period?
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
Dinner B which costs $135.30 for dinner submitted by salesperson with mean cost of $117.50 and standard deviation of $30 per dinner?
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