Question

The results below are based on data collected as part of a student project for an introductory statistics class at UF. If there is more than one group/treatment, the first group mentioned is group 1. Data was collected to determine if the price of food items at Graham Oasis (a convenience store inside UF campus) is higher, on average, than at a Publix Supermarket located 2 miles away. The p-value was 0.000, and the confidence interval was ( 0.85, 1.62).

The students selected food items and checked their prices at both stores. This problem is about ( 2 independent means, dependent means, 2 independent porpotions, dependent porpotions, one mean, one porption)

. The sign of the alternative hypothesis should be (less than, greater than, equal to, not equal to)

Based on the p-value we can ( Reject or not reject Ho)at alpha = 0.05.

At which alpha levels could we Reject Ho?

Are the results statistically significant at alpha=0.01?

We have (some, very strong, pretty strong, not eough) evidence to say that the average price of food items at Graham Oasis is higher than Publix

. We are 95% confident that the average price of food items at Graham Oasis is between ( .85 and $1.62 higher, .85 highrt and $1.62 lower, $1.62 lower and .85, $1.62 higher and .85lower) than at Publix.

The results of the confidence interval and significance test at alpha=0.05 ( agree, do not agree bc one sides. do not agree bc 2 sided)

. The population of interest is (all food items for which data was collected, all food items, all food items at both stores, all food at least one store)

We need to assume the sample was randomly selected because we are making inferences about .

For the students collecting the data, it would be (easy, hard) to select a random sample from this population.

Students collecting the data should strive for .

Answer 1

1. Data was collected to determine if the price of food items at Graham Oasis (a convenience store inside UF campus) is higher, on average, than at a Publix Supermarket located 2 miles away. The p-value was 0.000, and the confidence interval was ( 0.85, 1.62).The students selected food items and checked their prices at both stores.

(a)2 independent means,

(b)greater than

(c)Based on the p-value we can Reject at alpha = 0.05. ( p-value=0.000 is less than alpha)

(d)At which alpha levels could we Reject Ho? 0.05

(e)Are the results statistically significant at alpha=0.01? Yes

(f) We have very strong, evidence to say that the average price of food items at Graham Oasis is higher than Publix.

since p-value is about 0

(g)We are 95% confident that the average price of food items at Graham Oasis is between ( .85 and $1.62 higher)

(h)The results of the confidence interval and significance test at alpha=0.05 ( do not agree bc 2 sided)

(i)The population of interest is (all food items

(k)For the students collecting the data, it would be (easy,) to select a random sample from this population.