The local Hannaford is tracking mask compliance in their stores. In mid-March they found that only 40% of customers were wearing masks. They want to know if that percentage increased with the government mandates in place. Select the correct symbols to write the null hypothesis for this hypothesis test. Ho: ___________, _____________ .40

A decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 097%. Suppose that we have reason to believe that this proportion has changed, and we wish to carry out a hypothesis test to see if our belief can be supported. State the null hypothesis H and the alternative hypathesis A that we would use for this test. H 0 H:0 ?

A study by researchers at a university addressed the question of whether the mean body temperature of an animal is 98.8°F. Among other data, the researchers obtained the body temperatures of 104 healthy animals. Suppose you want to use those data to decide whether the mean body temperature of healthy animals is less than 98.8°F. Complete parts (a) through (c) below. -.... a. Determine the null hypothesis. Ho: H (Type an integer or a decimal. Do not round.) b. Determine the alternative hypothesis. Ha: H (Type an integer or a decimal. Do not round.) c. Classify the hypothesis test as two tailed, left tailed, or right tailed. The hypothesis test is

Part 2 and 3

A national polling agency conducted a survey based on a random sample of Americans. The poll finds that 26% of Americans approve of the job that the President is doing; the poll has a margin of error of 8% (assuming a 95% degree of confidence).   Step 1 of 3:  Complete the statement:We can be 95% confident that the percentage of all Americans that approve of the job that the President is doing is  _______________________. Enter your answers as percentages.

According to a University Center for Logistics Management, 10% of all merchandise sold in the United States gets returned. A Seattle department store sampled 89 items sold in January and found that 8 of the items were returned.If you have the following null and alternative hypotheses for a test you are running:H0:p=0.1Ha:p≠0.1Calculate the test statistic, rounded to 3 decimal places

Consider this study and identify the null hypothesis. (Remember: the null hypothesis is what Noel Hypothesis believes- that whatever interesting features you might think your data has are just coincidences.) An Uber driver's average customer rating is a 4.3. She decides to change how she greets passengers to a new greeting and see whether it changes how customers rate her. After the change, on her first 50 customers she sees an average rating of 4.47. Use u for her average rating from all customers using her new greeting. Ο Ημ 4.3 Hou > 4.3 Hoiu #4.3 Hou = 4.47 O Hou < 4.47 HoH+4.47

A decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 66%. Suppose that we have reason to believe that this proportion has changed, and we wish to carry out a hypothesis test to see if our belief can be supported. State the null hypothesis H 00 and the alternative hypothesis H, that we would use for this test. H, :0 H, :0

Research has shown that IQ scores have been increas- ing for years (Flynn, 1984, 1999). The phenomenon is called the Flynn effect and the data indicate that the in- crease appears to average about 7 points per decade. To examine this effect, a researcher obtains an IQ test with instructions for scoring from 10 years ago and plans to administers the test to a sample of n 5 25 of today’s high school students. Ten years ago, the scores on this IQ test produced a standardized distribution with a mean of m 5 100 and a standard deviation s 5 15. If there actually has been a 7-point increase in the average IQ during the past ten years, then find the power of the hypothesis test for each of the following. The researcher uses a two-tailed hypothesis test with a 5 .05 to determine the data indicate a sig- nificant change in IQ over the past 10 years. The researcher uses a one-tailed hypothesis test with a 5 .05 to determine the data indicate a sig- nificant increase in IQ over the past 10…

section 10.2  Step 1 of 3 : State the null and alternative hypotheses for the test. Fill in the blank below. Step 2 of 3 : Compute the value of the test statistic. Round your answer to three decimal places. Step 3 of 3: Do we reject the null hypothesis? Is there sufficient or insufficient data?