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Question 1
During 2002 the number of beds required per day at St Hallam's hospital was normally distributed with a mean of 1800 and a standard deviation of 190. During the first 50 days of 2003 the average daily requirement for beds was 1830. A senior hospital manager claims that this gives evidence that the requirements for beds has changed since 2001. Do you agree?
Question 2
The following data were obtained in an experiment to estimate a possible relation between the number of showings in one week of a TV commercial in typical sales territories and the sales (in thousands of units) in that territory of the advertised article.
Territory
1
2
3
4
5
6
7
8
9
10
Showings
0
Sales
2.6
1.2
3.6
0.5
3.2
1.8
2.5
(i) Show that the data is significantly correlated.
(ii) Construct a scatter pot of the data.
(iii) Obtain a linear regression model for sales against number of showings per week.
(iv) What will be the estimated sales if there are 7 showings in a week? And for 20 showings?
suppose three fair dice are rolled at the same time.a what is the probability that at least one number will be less
4. Why is a 99% confidence interval wider than a 95% confidence interval?
the irs was interested in the number of individual tax forms prepared by small accounting firms. the irs randomly
Calculate SSR(X3|X1), that is the sequential sum of squares obtained by adding X3 to a model already containing only the predictor X1. Show your work.
A wholesaler assures retailer replacement times for TVs normally dist. with mean of 8.2 and s.d. of 1.1. The retailer finds that a random sample of 20 sets from the wholesaler have mean replacement time of 7.6 years.
The scores on the certain test are "normally distributed with mean 61" and "standard deviation 3". Determine the probability that the sample of 100 students will have the mean score of at least 61.3?
Perform a hypothesis test to determine if there is a significant correlation (α =0.05) between number of hours of overtime worked and hours of sleep
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
What is the relative frequency or empirical probability of men between 30 and 40 becoming seriously ill during a 1-year period?
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
Wheel-Rite has agreed to ship the maximum number of wheel bearings that it produces each day to Itex when an order has been received.
the following sales data are available for 2003-2008.year demand2003 72004 122005 142006 202007 162008 25determine a
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