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Q1) The experiment has single factor with 5 groups and 7 values in each group.
a) How many degrees of freedom are there in finding among-group variation?
b) How many degrees of freedom are there in finding the within-group variation?
c) How many degrees of freedom are there in finding the total variation?
Q2) Operations manager at light bulb factory wishes to find whether there is any difference in the mean life types of machines. Population standard deviation of machine I is 110 hours and of machine II is 125 hours. Random sample of 25 light bulbs from machine I points out a sample mean of 375 hours, and similar sample of 25 from machine II points out a sample mean of 362 hours.
i) By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?
ii) Calculate p-value and interpret its meaning.
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
Which of the following(s) can be considered (a) variable(s)?
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
What is the 95% confidence interval for the difference between the mean prices of the two models?
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
The mean of a sample is 22.5. The mean of 1000 bootstrapped samples is 22.491. The bias of the bootstrap mean is
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
Which of the following is the appropriate conclusion from carrying out these multiple comparisons
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
Write introduction to STATISTICAL PROCESS CONTROL and Explain the use of SPC tools used at D2D
Which statement is true for a statistical study?
The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
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