10.2

7.

  1. 2.31 > 1.645 reject null hypothesis p > 0.3
  2. 0.014 < 0.05 reject null hypothesis p > 0.03
  3. reject null hypothesis

9.

  1. null hypothesis H:P = 0.52 Alternative H : p =/ 0.52
  2. p-value reject null hypothesis
  3. parents feel differently today then 1994 reject

11.

  1. z = -1.49
  2. reject null hypothesis 0.05
  3. does not fall in the rejection reject fail to reject null hypothesis 13.

p = 0.2743 > 0.05 insufficient evidence to support that dart picking strategy is a successful method to pick winning stocks

15.

  1. 0.472 P = 0.50 = P value is 0.0721

  2. The conclusion is that the significant p value in this context is greater than 0.05 which is 0.0721 so the null hypothesis is not rejected at 5% level of significance. = Insufficient evidence to indicate that the proportion of cramer is correct less than half time

17.

  1. = 16.1(>10) =0.65 p value = 0.2578

  2. there is no evidence to conclude that the lipitor users experience flulike symptoms as a side effect is more than 1.9

19.

  1. 0.022

  2. p value is less than 0.05 which is 0.022 so the null hypothesis is rejected at 5%. there is sufficient evidence to indicate that traffic fatalities involving a positive BAC higher than the United States is 0.39 the result is statistically significant.

10.3

1.

  1. =2.602

  2. -1.729

  3. = -2.179 = 2.179

2.

  1. 1.321

  2. -2.426

  3. = -2.738 = 2.738

3.

  1. -1.379

  2. = - 1.714

  3. skip

  4. we do not reject null hypothesis there is not sufficient evidence for the reseracher to reject the hypothesis

4.

  1. = 2.6744

  2. =1.318

  3. skip

  4. 2.6744 is greater than 1.318 there is enough evidence to reject null hypothesis

5.

  1. 2.502

  2. +/- 2.819

  3. skip

  4. -2.819<2.502<2.819 reject null hypothesis

  5. Lower bound = 99.39 upper bound = 110.21

11.

Ho: = $67

H1: > $67

  1. there is a 0.02 probablitiy of obtaining a sample mean of $73 or higher from a population whose mean is $67 we would expect about 2 of these samples to result in sample means of $73 of higher

  2. (0.02<0.05) P = 0.02 A = 0.05 people withdraw more money from a pay ease atm

13.

Ho: = 22

H1: > 22

  1. N > 30 the sample . X is approximately normal distribution

  2. 2.1757

  3. Students who complete the core curriculum is ready for college level math if they score above a 22

15.

p value = 0.4530 the p value is the area under the distribution with 11 degrees of freedom to the right of test statistic 0.778

17.

TEst statistic value = 0.81 there is no evidence to reject the null hypothesis. there is sufficient evidene to conclude that the population mean is less than or equal to 703.5

19.

yes the population has to be normally distributed to test the hypothesis Ho : = 105 Ha : =/ 105 P =0.004