Inexpensive Food! Despite the fact that we realize it may not be useful for us, numerous Americans truly make the most of their cheap food! An overview directed by Seat Exploration Centerl9 graphically outlined our inclination for eating out, and specifically, eating cheap food:

Level of Americans who ioften " or "now and then" gorge lousy nourishment

All grown-ups

Eat out.... 2+ times each week

1 time seven days Not exactly week by week or never

Eat inexpensive food... 2+ times each week

1 time seven days Not exactly week by week or never

16

55

38

38

32

61 54 50

48

67

65

? Regularly ? In some cases

a. This study depended on "phone interviews directed with a broadly agent test of 2250 grown-ups, ages 18 years and more established, living in mainland U.S. phone families." What issues may emerge with this sort of examining? b. How precise do you expect the rates given in the overview to be in assessing the real populace rates? (Clue Discover the room for give and take.)

c. On the off chance that you need to diminish your room for give and take to be *1%, how enormous an example would it be a good idea for you to take?

America's Market Basket An advertisement for a popular supermarket chain claims that it has had consistently lower prices than one of its competitors. As part of a survey conducted by an independent price-checking company, the average weekly total, based on the prices of approximately 95 items, is given for this chain and for its competitor recorded during four consecutive weeks in a particular month. Week Advertiser ($) Competitor ($) 254.26 256.03 240.62 255.65 MON - 231.90 255.12 234.13 261.18 a. Is there a significant difference in the average prices for these two different supermarket chains? b. What is the approximate p-value for the test conducted in part a? c. Construct a 99% confidence interval for the difference in the average prices for the two supermarket chains. Interpret this interval.No Left Turn An experiment was conducted to compare the mean reaction times to two types of traffic signs: prohibitive (No Left Turn) and permissive (Left Turn Only). Ten drivers were included in the experiment. Each driver was presented with 40 traffic signs, 20 prohibitive and 20 permissive, in random order. The mean time to reaction (in milliseconds) was recorded for each driver and is shown here. Driver Prohibitive Permissive B2 702 725 841 744 4 770 663 5 829 792 764 708 857 747 831 685 846 742 759 610 MS Excel printout for Exercise 10.42 E t-Test: Paired Two Sample for Means Prohibitive Permissive Mean 818.7 118 Variance 1573.344444 2596.4 Observations 10 10 Pearson Correlation 0.693852753 Hypothesized Mean Difference 0 df t Stat 9.14983257 PIT