At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. Wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. The cyclic nature of wind and moving sand determines the shape and location of large dunes. At a test site, the prevailing direction of the wind did not change noticeably. However, the velocity did change. Sixty-five wind speed readings gave an average velocity of x= 1075 cm/sec. Based on long-term experience, o can be assumed to be 265 cm/sec. (a) Find a 95% confidence interval for the population mean wind speed at this site. (Round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec (b) Does the confidence interval indicate that the population mean wind speed is such that the sand is always moving at this site? Explain. O No. This interval indicates that the population mean wind speed is such that the sand may not always be moving at this site. O Yes. This interval indicates that the population mean wind speed is such that the sand may not always be moving at this site. O Yes. This interval indicates that the population mean wind speed is such that the sand is always moving at this site. O No. This interval indicates that the population mean wind speed is such that the sand is always moving at this site.

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. Wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. The cyclic nature of wind and moving sand determines the shape and location of large dunes. At a test site, the prevailing direction of the wind did not change noticeably. However, the velocity did change. Sixty-three wind speed readings gave an average velocity of x = 1075 cm/sec. Based on long-term experience, σ can be assumed to be 275 cm/sec. 1. Find a 95% confidence interval for the population mean wind speed at this site. (Round your answers to the nearest whole number.) lower limit     cm/sec upper limit     cm/sec 2. Does the confidence interval indicate that the population mean wind speed is such that the sand is always moving at this site? Explain. (a) No. This interval indicates that the population mean wind speed is such that the sand may not always be moving…

In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the portion of the brain responsible for long-term memory storage, in adolescents. The researchers randomly selected 18 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm°. An analysis of the sample data revealed that the hippocampal volume is approximately normal with x - 8.01 cm and s 0.8 cm°. Conduct the appropriate test at the a 0.01 level of significance. State the null and alternative hypotheses. Ho H Hi H (Type integers or decimals. Do not round.) Identify the t-statistic (Round to two decimal places as needed.) Identify the P-value. P-value (Round to three decimal places as needed.) Make a conclusion regarding the hypothesis cm3 the null hypothesis. There sufficient evidence to claim that the mean hippocampal volume is

Based on data from 34 adults who exercise regularly, the line of best fit for the relationship between bicep girth (the length in centimeters around the upper arm) and the person's weight is: predicted weight = 2.6 bicep girth – 10.5 %3D where predicted weight is measured in kilograms and bicep girth is measured in centimeters.