A bag of 8 apples cost $2.88. What is the cost of one apple
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The diet which is developed by the nutritionist is effective at the 0.05 level of significance. Claim is agreed.
<h3>When do we use two-sample t-test?</h3>The two-sample t-test is used to determine if two population means are equal.
A nutritionist has developed a diet that she claims will help people lose weight. In this,
- Twelve people were randomly selected to try the diet.
- Their weights were recorded prior to beginning the diet and again after 6 months.
Here are the original weights, in pounds, with the weight after 6 months in parentheses.
- Before 192 212 171 215 180 207 165 168 190 184 200 196
- After 183 196 174 211 160 191 162 175 190 179 189 195
The mean of the weights before 6 moths is,
The mean of the weights after 6 months is,
Standard deviation of both the data is 16.9 and 14.7.
1. Null and Alternative Hypotheses.
The following null and alternative hypotheses need to be tested:
This corresponds to a right-tailed test, for which a t-test for two population means, with two independent samples, with unknown population standard deviations will be used.
- (2) Rejection Region
Based on the information provided, the significance level is α=0.05 and the degrees of freedom are df = 22. In fact, the degrees of freedom are computed as follows, assuming that the population variances are equal:
Hence, it is found that the critical value for this right-tailed test is
, for α=0.05 and df=22
The rejection region for this right-tailed test is,
(3) Test Statistics
Since it is assumed that the population variances are equal, the t-statistic is computed as follows:
- (4) Decision about the null hypothesis
Since it is observed that t=0.967≤tc=1.717 it is then concluded that the null hypothesis is not rejected.
Using the P-value approach: The p-value is p=0.1721 and since p=0.1721≥0.05p = 0.1721 it is concluded that the null hypothesis is not rejected.
(5) Conclusion
It is concluded that the null hypothesis H₀ is not rejected. Therefore, there is not enough evidence to claim that the population mean μ1 is greater than μ2, at the α=0.05 significance level.
Confidence Interval
The 95% confidence interval is −7.16<μ<19.66
Thus, the diet which is developed by the nutritionist is effective at the 0.05 level of significance. Claim is agreed.
Learn more about the two-sample t-test here;
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I'll answer problem 9 to get you started
<h3>Answer: Choice (2) 3x-1 = 2x+3</h3>===============================================
Explanation:
We will plug x = 7 into each equation or inequality given to us. Then we determine if we get a true statement or not.
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Let's start with choice (1)
x + 3 > 6
7 + 3 > 6 .... x is replaced with 7
10 > 6
Since 10 is larger than 6, this makes the last inequality true. Therefore, the first inequality is true when x = 7. So we can rule out choice (1) since we are looking for a false statement.
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Move onto choice (2)
3x-1 = 2x+3
3*7-1 = 2*7+3 ... replace every x with 7
21-1 = 14+3
20 = 17
This is false since we don't get the same number on each side. Therefore, choice (2) is the final answer.
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Since we found the answer, we can stop here. But let's keep going to check the others.
choice (3)
2(x+1) = x+9
2*(7+1) = 7+9 ... plug in x = 7
2*(8) = 16
16 = 16
We get the same thing on both sides, so the equation is true. We can rule out choice (3).
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Now onto choice (4)
This is true since -4 is to the left of 0 on the number line, which makes -4 smaller than 0. We can rule out choice (4).