1. During the COVID-19 Pandemic, while school-aged children were attending classes online, 70% of parents f overwhelmed. It is believed this percent has decreased. A simple random sample of 500 parents was surveyed said they felt overwhelmed. Is this enough evidence to conclude that the percentage of parents who feel overwhelmed has decreased from the Pandemic/Stay at Home Era? a. State the Ho and the Ha b. Calculate the test statistic and the p-value c. Reject or fail to reject Ho

Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.

From the same cohort, all cases and 10 controls per case were chosen for analysis. The following results were observed. Serum Level of Vitamin D Incident Cases of MS Healthy Individuals Above 40 ng per ml 40 20-40 ng per ml 4 40 Below 20 ng per ml 4 20 What is the odds ratio for individuals with serum levels of vitamin D of 20-40 ng per ml? O 4.0 О 30 O 1.0 O 2.0 2.

In one study of smokers who tried to quit smoking with nicotine path​ therapy,38 were smoking one year after the​ treatment, and 32 were not smoking one year after the treatment. Use a 0.10 significance level to test the claim that among smokers who try to quit with nicotine patch​ therapy, the majority are smoking a year after the treatment. d. Calculate the test statistic z. Which of these options is closest to​ z?     A. negative 2.02     B. 0.72     C. negative 0.25     D. 2.59     e. Calculate the​ P-value. Which of these options is closest to the​ P-value?     A. 0.2358     B. 0.2164     C. 0.3359     D. 0.2271     f. State the technical conclusion     A. Reject Upper H 0     B. Do not reject Upper H 0     g. State the final conclusion     A. There is sufficient evidence to warrant rejection of the claim.   B. There is not sufficient evidence to warrant rejection of the claim.…

A publisher reports that 69 % of their readers own a particular make of car. A marketing executive wants to test the claim that the percentage is actually under the reported percentage. A random sample of 200 found that 60% of the readers owned a particular make of car. Is there sufficient evidence at the 0.10 level to support the executive's claim? Step 5 of 7: Identify the value of the level of significance.