Question 1
A company keeps extensive records on its new salespeople on the premise that sales should increase with experience. A random sample of seven new salespeople produced the data on experience and sales shown in the table.
Summary statistics yield
SSxx = 94.8571,
SSxy = 124.7571,
SSyy = 176.5171,
= 5.8571, and
Calculate a 90% confidence interval for
E(
y) when
Assume
and the prediction equation is
Question 2
A realtor collected the following data for a random sample of ten homes that recently sold in her area.
| House | Asking Price | Days on Market |
| A | $114,500 | 29 |
| B | $149,900 | 16 |
| C | $154,700 | 59 |
| D | $159,900 | 42 |
| E | $160,000 | 72 |
| F | $165,900 | 45 |
| G | $169,700 | 12 |
| H | $171,900 | 39 |
| I | $175,000 | 81 |
| J | $289,900 | 121 |
| a. | Find a 90% confidence interval for the mean number of days on the market for all houses listed |
at $150,000.
| b. | Suppose a house has just been listed at $150,000. Find a 90% prediction interval for the number |
of days the house will be on the market before it sells.
A sample flow sheet.
Schematic representations of (a) random, (b) alternating, (c) block, and (d) graft copolymers.
Sample prescriptions of antibiotics for prophylaxis against infective endocarditis.
Sample of a weekly bookkeeping ledger.
Demographic Data for Nigeria
Sample Inclusion for Various s