In the process of using the scientific method, a researcher: Directly tests both the null and alternative hypotheses. Directly tests only the alternative hypothesis because this is the hypothesis of interest. Directly tests only the null hypothesis because this is the hypothesis of interest. Directly tests only the null hypothesis because the null hypothesis leads to a specific prediction that can be compared with data. O Can not directly test either hypothesis.

Calculate the mass density and uncertainty in the mass density of the sample block. Mass of the block is 289 ‡ 1gr.

Which of the following correctly describes A=90090 in scientific notation (with correct sig figs)? More than one answer MAY be correct. In these answers "E#" represents 10 raised to the power of #. 9.0090E5 None of the other answers is correct. 9.009E4 O 9.009E5 O 9.0090E3

The experimental value of the mass density of the sphere is 8.35g/cm^3. The accepted mass density is 7.87 g/cm^3. What is the percent error compared to the true value of the mass density? * O 42 O 6.1 O 4.2% 5.75%

According to a survey, 85% of American adults eat salad at least once a week. A nutritionist suspects that the percentage is higher than this. She conducts a survey of 200 American adults and finds that 171 of them eat salad at least once a week. Conduct the appropriate test that addresses the nutritionist's suspicion. Use an a = 0.05 level of significance. State the null and alternative hypothesis: What parameter are we testing? Ho: H₁: Assumptions: SRS, n < 0.05N, npo (1 - po) By hand, test statistic is (Round to 5 decimals): P-value. Round to 4 decimals: Conclusion: There is (enter sufficient or insufficient) evidence at the a = 0.05 level of significance to conclude that the percentage of adult Americans that eat salad at least once a week is ("equal to" or "higher than" or "less than" or "not equal to") 85%.

Final Answers should be in 3 significant figures.

Suppose the density of an atomic nucleus is 1.2 x 1018 kg/m³. What is this density in megagrams per microliter (that is, Mg/µL)? (1 mL has a volume of 1 cm³.) |

The main scale in a vernier instrument is graduated in millimeters, with the smallest division being 1mm. Ten divisions on the vernier scale correspond to 11 divisions on the main scale Answer the following questions. (a) Is the vernier scale a forward vernier or backward vernier? (b) What is the least count of the instrument? (c) If the main scale reads 12mm and the 10th division on the vernier scale coincides with a division on the main scale, what is the value of the dimension being measured?         Please answer in typing format please ASAP for the like please clear the

3. Which of the following is (are) correct about mixed-methods research?i. A research instrument can be employed to produce both objective measures and subjective narratives.ii. When there are discrepancies between the quantitative and qualitative sets of findings, it means there is no feasible explanation for the social phenomenon under investigation.iii. Qualitative data can be used to inform the formulation of hypotheses that can be tested via quantitative methods.iv. Mixed-methods research produces data of a higher level of quality and is therefore preferable to ‘single-method’ research whenever the budget allows. A. i, iiB. ii, iiiC. iiiD. iii, iv

(a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats does he or she have in 2.0 years? (b) In 2.00 years? (c) In 2.000 years?