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What's wrong? For each of the following, explain what is wrong and why.
(a) If b1 = 3 in a logistic regression analysis with one explanatory variable, we estimate that the probability of an event is multiplied by 3 when the value of the explanatory variable increases by 1 unit.
(b) The intercept β0 is equal to the odds of an event when x = 0.
(c) The odds of an event are 1 minus the probability of the event.
In determining the amount of oil the company must report as its lower limit of daily production, the company wants to choose an amount such that for 80% of the days, at least the reported amount x is produced. Determine the value of the lower limit..
to give a 99.9 confidence interval for a population mean ? you would use the critical valuea.z 2.576.b.z 1.960.c.z
Indicate at which point flat-of-the-curve medicine is experienced in the following example (imagine that antibiotics have been prescribed for a given population of 1,000 elderly persons).
Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
Based on our poll what is the margin of error of the proportion of voters favoring the incumbent?
A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean µ.
In a survey of students at a local college it was decided to give part-time students twice the chance of selection because of the smaller numbers involved and the diversity of their study patterns.
Age at first marriage, Part I: The National Survey of Family Growth conducted by the Centers for Disease Control gathers information on family life, marriage and divorce, pregnancy, infertility, use of contraception, and men's and women's health.
Prior to conducting this experiment, the manager believed the variance in inspection errors was lower for experienced inspectors than for novice inspectors. Do the sample data support her belief? Test using α = .05.
Finance 310 - calculate a standard deviation for each maturity. These are estimates of daily log-return volatilities. Scale them up to an annual basis (remembering that there are about 250 trading days/year).
Is there an association between time of year and the nighttime temperature in North Dakota?- What might you expect the correlation between DayNumber and Temperature to be? Explain.
Does there appear to be strong association between hand dominance and eye dominance?- What would large values in positions b and c tell you?
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