An old medical textbook states that the mean sodium level for healthy adults is 140 mEq per liter of blood. A medical researcher believes that, because of modern dietary habits, the mean sodium level for healthy adults, u, now differs from that given in the textbook. A random sample of 23 healthy adults is evaluated. The mean sodium level for the sample is 147 mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is 14 mEq. Assume that the population is normally distributed. Can we conclude, at the 0.10 level of significance, that the population mean adult sodium level differs from that given in the textbook? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H and the alternative hypothesis H₁. HO H₁:0 (b) Determine the type of test statistic to use. (Choose one) (c) Find the value of the test statistic. (Round to three or more decimal places.) F |x X 8 0=0 0#0 a S 2 00 050 く口 Р

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### Statistical Hypothesis Testing on Sodium Levels

An old medical textbook states that the mean sodium level for healthy adults is 140 mEq per liter of blood. A medical researcher believes that, because of modern dietary habits, the mean sodium level for healthy adults, \( \mu \), now differs from that given in the textbook. A random sample of 23 healthy adults is evaluated. The mean sodium level for the sample is 147 mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is 14 mEq. Assume that the population is normally distributed. 

**Research Question**: Can we conclude, at the 0.10 level of significance, that the population mean adult sodium level differs from that given in the textbook?

#### Instructions

Perform a two-tailed test. Then complete the parts below.

Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a [list of formulas](#).)

---

#### Steps:

**(a) State the null hypothesis \( H_0 \) and the alternative hypothesis \( H_1 \).**

\( H_0 : \)
\[ \text{Box for input} \]

\( H_1 : \) 
\[ \text{Box for input} \]

**(b) Determine the type of test statistic to use.**

\[ \text{Dropdown menu: (Choose one)} \]

**(c) Find the value of the test statistic. (Round to three or more decimal places.)**

\[ \text{Box for input} \]

**(d) Find the \( p \)-value. (Round to three or more decimal places.)**

\[ \text{Box for input} \]

**(e) Can we conclude that the population mean adult sodium level differs from that given in the textbook?**

\[ \text{Radio buttons: Yes or No} \]

---

The panel on the right includes symbols such as:

- \( \mu \), \( \sigma \), \( \rho \) for mean, standard deviation, and correlation
- \( \bar{x} \), \( s \), \( \hat{p} \) for sample mean, sample standard deviation, and sample proportion
- Different types of arrows indicating greater than, less than, or equals

Make sure to use the correct symbols and calculations to justify your conclusion.
Transcribed Image Text:### Statistical Hypothesis Testing on Sodium Levels An old medical textbook states that the mean sodium level for healthy adults is 140 mEq per liter of blood. A medical researcher believes that, because of modern dietary habits, the mean sodium level for healthy adults, \( \mu \), now differs from that given in the textbook. A random sample of 23 healthy adults is evaluated. The mean sodium level for the sample is 147 mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is 14 mEq. Assume that the population is normally distributed. **Research Question**: Can we conclude, at the 0.10 level of significance, that the population mean adult sodium level differs from that given in the textbook? #### Instructions Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a [list of formulas](#).) --- #### Steps: **(a) State the null hypothesis \( H_0 \) and the alternative hypothesis \( H_1 \).** \( H_0 : \) \[ \text{Box for input} \] \( H_1 : \) \[ \text{Box for input} \] **(b) Determine the type of test statistic to use.** \[ \text{Dropdown menu: (Choose one)} \] **(c) Find the value of the test statistic. (Round to three or more decimal places.)** \[ \text{Box for input} \] **(d) Find the \( p \)-value. (Round to three or more decimal places.)** \[ \text{Box for input} \] **(e) Can we conclude that the population mean adult sodium level differs from that given in the textbook?** \[ \text{Radio buttons: Yes or No} \] --- The panel on the right includes symbols such as: - \( \mu \), \( \sigma \), \( \rho \) for mean, standard deviation, and correlation - \( \bar{x} \), \( s \), \( \hat{p} \) for sample mean, sample standard deviation, and sample proportion - Different types of arrows indicating greater than, less than, or equals Make sure to use the correct symbols and calculations to justify your conclusion.
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